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.

Example Input: Context: Liu Bei combined forces with Cao Cao and defeated Lü Bu at the Link Information: The Battle of Xiapi was fought between the forces of Lü Bu against the allied armies of Cao Cao and Liu Bei from the winter of 198 to 7 February 199 Answer: from the winter of 198 to 7 February 199
Example Output: How long did the fight last in which Liu Bei and Cao Cao defeated Lü Bu?

Example Input: Context: His brother was Malcolm Fraser (1939–2012), Emeritus Professor of Opera at the University of Cincinnati and co-founder of the Buxton Festival Link Information: The Buxton Festival is an annual summer festival of opera, music, and (since 2000) a literary series, held in Buxton, Derbyshire, in England since its beginnings in July 1979 Answer: 1979
Example Output: Which year did the festival that Robert Fraser's brother helped co-found first start?

Example Input: Context: Born in Bundaberg, Queensland, he was the son of politician Harold Nelson. Link Information: Harold George "H. G." Nelson (21 December 1881 Answer: 26
Example Output:
How old was Jock Nelson's father when his son was born?