In this task, you're given a question, along with a context passage which has extra information available on certain terms mentioned in it. Your job is to determine which sentence(s) from the passage can be used to search for further information needed to answer the question.

Question: How old was General Sir William Robertson when he selected Hugh Elles to liasise with troops? Passage:In August 1915, after recovering from his injuries, Elles was one of three officers specially selected by General Sir William Robertson, soon to be Chief of the Imperial General Staff (CIGS), the professional head of the British Army, to liaise with troops at the front and pass the information directly to the British General Headquarters (GHQ). In January 1916, as a General Staff Officer (GSO), Elles was sent by General Sir Douglas Haig, the Commander-in-Chief (C-in-C) of the BEF on the Western Front, to investigate the first tanks or "caterpillars" being built in England. He attended the first trials of "Mother" and reported back to Haig on its success. During the summer of 1916, he was tasked to report back from the Somme, where the tanks were first used. Elles was appointed to head the Heavy Branch (the first tank units) of the Machine Gun Corps in France on 29 September 1916, with the temporary rank of colonel. His responsibilities included its advanced training and tactical employment. He also commanded the large central depot and workshops established near Bermicourt.

In August 1915, after recovering from his injuries, Elles was one of three officers specially selected by General Sir William Robertson, soon to be Chief of the Imperial General Staff (CIGS), the professional head of the British Army, to liaise with troops at the front and pass the information directly to the British General Headquarters (GHQ)

Question: Who is older, Lisker or the phonetician that he principally worked with? Passage:Leigh Lisker (December 7, 1918 March 24, 2006) was an eminent American linguist and phonetician. Most of his career was spent at the University of Pennsylvania, where he was a professor and then emeritus professor of linguistics. Dr. Lisker received his A.B. in 1941, with a major in German, his M.A. in 1946, and a Ph.D. in 1949 in linguistics. He was a major figure in phonetics, working both at the University of Pennsylvania and at Haskins Laboratories in New Haven, CT, where he was a senior scientist from 1951 until the end of his life. He collaborated with several phoneticians, principally Arthur S. Abramson. He is best known for his work, done mostly in conjunction with Abramson, on voice onset time. Dr. Lisker also made important contributions to Dravidian linguistics, including the book Introduction to Spoken Telugu (Telugu), and did research comparing phonetic and phonological perceptions on the part of linguistically naive and linguistically sophisticated speakers of different native language backgrounds. He conducted such studies in collaboration with Dr. Abramson of the University of Connecticut, Bh. Krishnamurti of University of Hyderabad, India, Adrian Fourcin of University College London, and Mario Rossi of the Institut de Phonetique at the Universite de Provence, Aix-en-Provence.

Leigh Lisker (December 7, 1918 March 24, 2006) was an eminent American linguist and phonetician

Question: Who was older when the song was produced? Passage:Initially, Nick Carter, aged 14 at the time, was unable to sing on the recording of the song as he was undergoing puberty. The remaining band members were brought over to Stockholm for a week to record "We've Got It Goin' On" in late December 1994. They unexpectedly finished the song in just two days and decided to record "Quit Playing Games (with My Heart)" immediately afterwards. The single was not the label's first choice to release for the group's US return, as they initially wanted to release the Mutt Lange-produced "If You Want It to Be Good Girl (Get Yourself a Bad Boy)", but the band argued against it, claiming that it was one of their worst songs. Jive president Barry Weiss claimed that the other serious contenders included "Anywhere for You" and "All I Have to Give". The group also wanted to reshoot the music video, but the label refused, arguing that they only planned to market towards radio, not video. The song ultimately succeeded without MTV support. The background vocals in the song, besides McLean's self-harmonization on the bridge, consisted of Brian Littrell and Kevin Richardson, who decided to finish the song while the remaining members were having lunch.
The background vocals in the song, besides McLean's self-harmonization on the bridge, consisted of Brian Littrell and Kevin Richardson, who decided to finish the song while the remaining members were having lunch