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: such as the Swiss band Hellhammer (later to become Celtic Frost) Link Information:  Formed in 1981 as Hellhammer, the band became Celtic Frost in 1984 Answer: 1984
[A]: In what year did Hellhammer become Celtic Frost?


[Q]: Context: . Middle Assyrian lead votive figurines Link Information: used to decorate cult statues, Answer:  clay, metal, wood, glass, and today plastic or resin 
[A]: What material were the symbols used by the Assyrians made of?


[Q]: Context: He graduated from the United States Military Academy in 1886, and was a classmate and close friend of John J. Pershing. Link Information: General of the Armies John Joseph "Black Jack" Pershing (September 13, 1860 – July 15, 1948) Answer: 26
[A]:
How old was John Pershing when he graduated from the United States Military Academy?