Definition: In this task, you're given a question, along with three passages, 1, 2, and 3. Your job is to determine which passage can be used to answer the question by searching for further information using terms from the passage. Indicate your choice as 1, 2, or 3.
Input: Question: which phase of sleep is the longest? Passage 1:Born in Montreal, Quebec, Berry began his junior hockey career with the Peterborough Petes of the OHA before deciding to attend Sir George Williams University (now Concordia University) in Montreal where he would play three years of collegiate hockey in the OQAA (now CIS). In 1966 Berry joined Canada's National Hockey Team and was later signed by the Montreal Canadiens to his first professional contract in 1968 at age 25. With the Canadiens having a deep roster at left wing, Berry would only manage to suit up for two games with the Canadiens in 1968-69. He spent the following year playing in the AHL for the Montreal Voyageurs and the Canadiens eventually sold his rights to the Los Angeles Kings in 1970 giving him a better opportunity to earn a spot on an NHL roster. Berry joined the Los Angeles Kings the following year in 1970-71 and registered 63 points in 73 games in his rookie season, placing him only 9 points back of eventual Calder Trophy winner Gil Perreault of the Buffalo Sabres. In 1972-73 Berry scored a career high 36 goals with the Kings and was selected to play in his first NHL All-Star game on January 30, 1973 at Madison Square Garden in New York. Berry was selected to play in the All-Star game again the following year at the Chicago Stadium. He finished his NHL career with 350 points in 541 regular season games.
 Passage 2:The German torpedo boat T7 was one of a dozen Type 35 torpedo boats built for the Kriegsmarine (German Navy) during the late 1930s. Completed in 1939, she was not combat ready until mid-1940 when she spent several months escorting minelayers as they laid minefields in the North Sea and the English Channel. The boat participated in an abortive attempt to attack several convoys off the Scottish coast in November. T7 returned to Germany for a refit in January 1941 and then supported operations in the Baltic Sea after the start of Operation Barbarossa in June. The boat was one of the escorts for several commerce raiders passing through the English Channel in late 1941 and then escorted German ships in Norwegian waters in mid-1942. She was briefly placed in reserve later that year and was then reactivated for service with the Torpedo School. T7 was sunk in an air raid in July 1944, but was refloated several months later. She was never repaired and was scrapped in 1947–1949.
 Passage 3:Von Economo, in his studies, noticed that lesions in the connection between the midbrain and the diencephalon caused prolonged sleepiness and therefore proposed the idea of an ascending arousal system. During the past few decades major ascending pathways have been discovered with located neurons and respective neurotransmitters. This pathway divides into two branches: one that ascends to the thalamus and activates the thalamus relay neurons, and another one that activates neurons in the lateral part of the hypothalamus and the basal forebrain, and throughout the cerebral cortex. The cell group involved in the first pathway is an acetylcholine-producing cell group called pedunculopontine and laterodorsal tegmental nucleus(PPT/LDT). These neurons play a crucial role in bridging information in between the thalamus and the cerebral cortex. These neurons have high activation during wakefulness and during REM sleep and a low activation during NREM sleep. The second branch originates from monoaminorgenic neurons. These neurons are located in the locus coeruleus, dorsal and median raphe nuclei, ventral periaqueductal grey matter, and tuberomammillary nucleus. Each group produces a different neurotransmitter. The neurons in the locus coeruleus produce noradrenaline, as fore the neurons in the dorsal and median raphe nuclei, ventral periaqueductal grey matter, and tuberomammillary nucleus produce serotonin, dopamine and histamine respectively. They then project onto the hypothalamic peptidergic neurons, which contain melanin-concentrated hormones or orexin, and basal forebrain neurons which contain GABA and acetylcholine. These neurons then project onto the cerebral cortex. It has also been discovered that lesions to this part of the brain cause prolonged sleep or may produce coma.

Output:
3