TASK DEFINITION: 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.
PROBLEM: Context: spin-off show Holby City Link Information: Casualty, stylised as CASUALY, is a British medical drama series that airs weekly on BBC One. It is the longest-running emergency medical drama television series in the world, and the most enduring medical drama shown on prime time television in the world. Created by Jeremy Brock and Paul Unwin, it was first broadcast in the United Kingdom on BBC One on 6 September 1986.  Answer: 13

SOLUTION: How long had Casualty been airing before its spinoff first aired?

PROBLEM: Context: He was subsequently picked up by the American DC Comics, and as "the first comics writer living in Britain to do prominent work in America" Link Information: none Answer: none

SOLUTION: How many years did Alan Moore work at DC Comics?

PROBLEM: Context: At the beginning of World War II, Kershaw served with the Thames River police, then was commissioned second lieutenant in the 16th/5th Lancers on 15 June 1940 Link Information: The start of the war in Europe is generally held to be 1 September 1939, Answer: 9

SOLUTION:
How many months after the beginning of World War II was Kershaw commissioned as a second lieutenant?