Instructions: 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: What is Probyn's Horse? Passage 1:Vera first appears in "The New World" when she is called upon to treat Rex Matheson (Mekhi Phifer), who has been impaled through the chest by a metal pole. Vera conveys news that Rex has survived to his colleague Esther (Alexa Havins) along with the news that no one has died in the past 24 hours, which she corroborates with accounts from other hospitals. In "Rendition" Vera realises that the hospitals cannot cope and suggests overriding the orthodox triage system so that in the wake of "Miracle Day" those with less severe illnesses are treated first. She later joins a series of medical panels; she engages the help of one to provide Rex with instructions to concoct emergency EDTA which when used as a chelating agent saves the life of a poisoned and now mortal Jack (John Barrowman). "Dead of Night" marks the beginning of a sexual relationship between Rex and Vera; he later enlists her to aid Torchwood's infiltration of a Phicorp conference. Unlike onlookers, she is disgusted by the battle for popularity between Oswald Danes and a rival spokesperson which occurs on the grounds of her hospital. In "The Categories of Life", when the Washington medical panels are abandoned in the wake of a new system of categorising life Vera allies herself with the Torchwood group, now based in Los Angeles. She goes undercover as an inspector of the San Pedro overflow camp against Rex's wishes. Appalled at the inhumane conditions and low management standards she tells camp manager Colin Maloney (Marc Vann) she wants him prosecuted. Maloney shoots Juarez twice and takes her to a 'module' within the camp. This is revealed to be a giant oven used to burn surplus but still alive people; Vera is incinerated whilst a horrified Rex watches on.
 Passage 2:No church at Tong is mentioned in Domesday Book. At that point Roger de Montgomery, Earl of Shrewsbury, held the manor both as tenant-in-chief and as manorial lord. The cartulary of Shrewsbury Abbey shows that Earl Roger granted it the advowson of the church at Tong and a pension of half a mark from its income, so the church must have been built between Domesday in 1087 and his death in 1094. After Robert of Bellême, 3rd Earl of Shrewsbury forfeited his family’s lands through revolt, Tong and nearby Donington were granted by Henry I to Richard de Belmeis I, his viceroy in Shropshire and the Welsh Marches, who also became Bishop of London, and who held the churches on both estates from Shrewsbury Abbey until his death in 1127. He ensured the two churches were restored to Shrewsbury Abbey on his death but his secular holdings went to his nephew Philip de Belmeis, one of the founders of Lilleshall Abbey.
 Passage 3:Lieutenant-General Sir William Henry Goldney Baker (7 December 1888 – 28 December 1964) was a British officer who served in the British Indian Army. Commissioned into the Indian Army in 1910 he served in France during the First World War with the 34th Poona Horse and later the Cheshire Regiment, of which he was temporary commander of the 1st battalion. Bakerwas mentioned in dispatches three times and awarded the Distinguished Service Order. In 1918 he fought the Marris in India with the 31st Duke of Connaught's Own Lancers. Baker held a series of staff officer positions after the war before being promoted to lieutenant-colonel and receiving command of Probyn's Horse in 1935. He was promoted to the temporary rank of brigadier and commanded troops in action in Waziristan in 1936 and 1937, being again mentioned in dispatches. During the Second World War Baker was an aide-de-camp to King George VI and was promoted to the rank of lieutenant-general.

Output:
3