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.

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
In what year did Hellhammer become Celtic Frost?

Context: Modelmaker Peter Firmin and writer Oliver Postgate similarly created several stop-motion animated works for children during this period, including "Pingwings" (1961–1964), "Pogles' Wood" (1966–1967) and "Clangers" (1969–1972). Link Information: none Answer: none
Which of the stop-motion animated works created by Firmin and Postgate had the most success?

Context: The most prominent were a contingent of front-line light cavalry in a Cossack regiment commanded by a female colonel, Alexandra Kudasheva. Others included Maria Bochkareva, who was decorated three times and promoted to senior NCO rank Link Information: Colonel Alexandra Kudasheva (1873–1921?) Answer: Alexandra Kudasheva

Which prominent female leader in the Cossack regiment was born first?