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: Are olives the largest export in Sassari? Passage 1:Pallikaranai wetland is a freshwater marsh in the city of Chennai, India. It is situated adjacent to the Bay of Bengal, about south of the city centre, and has a geographical area of . Pallikaranai marshland is the only surviving wetland ecosystem of the city and is among the few and last remaining natural wetlands of South India. It is one of the 94 identified wetlands under National Wetland Conservation and Management Programme (NWCMP) operationalised by the Government of India in 1985–86 and one of the three in the state of Tamil Nadu, the other two being Point Calimere and Kazhuveli. It is also one of the prioritised wetlands of Tamil Nadu. The topography of the swamp is such that it always retains some storage, thus forming an aquatic ecosystem. A project on 'Inland Wetlands of India' commissioned by the Ministry of Environment and Forests, Government of India had prioritised Pallikaranai marsh as one of the most significant wetlands of the country. The marsh contains several rare or endangered and threatened species and acts as a forage and breeding ground for thousands of migratory birds from various places within and outside the country. The number of bird species sighted in the wetland is significantly higher than the number at Vedanthangal Bird Sanctuary.
 Passage 2:Sassari is located in north-western Sardinia, at above sea level. The area rises up on a wide karstic plateau that slopes gently down towards the Gulf of Asinara and the Nurra plain. The city is surrounded by a green belt of thousands of hectares of olive plantations, which from the 19th century have partly replaced the mixed woodlands of oak and other Mediterranean trees as well as the maquis shrubland. The thinly populated Nurra Plain, located to the west, occupies the main part of the region of Sassari, while the urban agglomeration, with a population of about 275,000 inhabitants, is located to the south east. The abundance of water, with about 400 springs and artesian wells, has made for much development of horticulture over the centuries.
 Passage 3:On February 25, 1956, Khrushchev gave a clandestine speech to the Twentieth Party Congress of the Communist Party of the Soviet Union, which was entitled, "On the Cult of Personality and Its Consequences", which denounced Stalin and his protégés. Khrushchev charged Stalin with fostering a personality cult, despite maintaining support for the ideals of communism. The speech was highly critical of Stalin and his reign of terror, primarily denouncing the purges of the Soviet military and Communist Party, which had taken place during the latter part of the 1930s. The speech brought forth several accusations, notably those concerning the Moscow Trials, where rulings were made, based on forced confessions, which were obtained through torture. Judicial decisions were determined, based on liberal interpretations of Article 58 of the Russian SFSR Penal Code, which was introduced in 1927, in order to arrest individuals suspected of counter-revolutionary activities. Due process, in accordance with Soviet law, was often dismissed and replaced with summary proceedings issued by institutional commissions known as NKVD troikas, who issued sentences to the accused without representation, defense, or trial.

Output:
2