In this task, you're given a context, further information available on a particular linked term from the statement, and an answer term. Your job is to generate a question that can use the information provided to obtain the given answer. You should use the information on both context and link information to create the question. Note that the answer to the question should be exactly the given answer, and if the answer is none, the answer to the question shouldn't be obtainable from the context or linked information.

[Q]: Context: He was a leading officer in the Red Army and, during the Russian Civil War, worked closely with L.D. Trotsky. Link Information: Leon Trotsky (; born Lev Davidovich Bronstein; – 21 August 1940 Answer: 1940
[A]: What year did Trotsky die?


[Q]: Context: SST also released the Descendents live albums Liveage! (1987) and  (1989), both recorded during the final two Descendents tours Link Information: The band's first live album, it was recorded July 13, 1987 at First Avenue in Minneapolis during their summer 1987 "FinALL" tour, so-called because singer Milo Aukerman was leaving the Descendents to pursue a career in biochemistry, after which the band was relaunching itself under the name All. Answer: Milo Aukerman
[A]: Who sang on the Descendents live albums after Milo Aukerman left?


[Q]: Context: In 1919, while working as a consultant to the British entrepreneur Lord Cowdray, DeGolyer negotiated the sale of the El Aguila company to Royal Dutch Shell Link Information: The Royal Dutch Shell Group was created in April 1907 Answer: 12
[A]:
How long had Royal Dutch Shell been a company for the year it purchased El Aguila?