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: How old was Lincoln Ellsworth when he first obtained phots of Eros Glacier? Passage 1:Having matriculated at the University of Glasgow, where he won an entrance scholarship, he left that university to join his father and other members of the family to emigrate to New Zealand. They landed in Otago in 1862 and Denniston Sr. took up a run Oteramika in Southland. His father died at his house at Fendalton, Christchurch, in 1897. Denniston Jr saw service in various capacities, including the civil service and that of the Bank of New South Wales, and then became a law student with William Downie Stewart. He was admitted to the New Zealand Bar at Dunedin by Justice Chapman on 4 August 1874. For some months he practised at Wanganui in partnership with George Hutchison, afterwards a prominent member of the House of Representatives. In 1875, he became associated with Downie Stewart in Dunedin and the firm was subsequently joined by Allan Holmes, son of the Hon. Mathew Holmes, MLC, under the style of Stewart, Holmes and Denniston, and acquired an extensive practice in Otago. Court work was undertaken by Denniston, whose name was connected with most of the important civil and criminal cases in the province. In 1889, he was elevated to the bench on the death of Justice Alexander James Johnston and was sworn in by His Honour Sir James Prendergast, Chief Justice of New Zealand, in February 1889. Denniston was knighted on 21 February 1917 upon his retirement from the bench.
 Passage 2:Eros Glacier () is a glacier on the east coast of Alexander Island, Antarctica, long and wide at its mouth, flowing southeast from the Planet Heights into George VI Sound immediately north of Fossil Bluff. It was probably first seen on November 23, 1935, by Lincoln Ellsworth, who flew directly over the glacier and obtained photos of features north and south of it. The mouth of the glacier was observed and positioned by the British Graham Land Expedition in 1936 and the Falkland Islands Dependencies Survey (FIDS) in 1948 and 1949. The glacier was mapped in detail from air photos taken by the Ronne Antarctic Research Expedition, 1947–48, by D. Searle of the FIDS in 1960. It was named by the UK Antarctic Place-Names Committee after the minor planet Eros in association with nearby Pluto Glacier and Uranus Glacier.
 Passage 3:Able to play on either flank as a full back, Wilkins began his career at Chelsea at the age of 10 and signed his first professional contract in 1972. He remained a bit-part player until the 1976–77 season, when he made 29 appearances to help the Blues to promotion back to the First Division. Wilkins remained at Stamford Bridge until July 1982, by which time he had made 151 appearances and scored one goal. He dropped down to the Third Division to join West London neighbours Brentford on a free transfer, but with the Bees he experienced "the worst two years of my life. I dislocated my shoulder, had seven teeth kicked out, ruptured my cruciate ligaments and that was it". Wilkins' final appearances as a professional came late in the 1983–84 season, on loan at Third Division club Southend United.

Output:
2