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.

[EX Q]: Context: The Korean War began and the Navy realized it had a need for an air station in the region Link Information: The Korean War (in South Korean , "Korean War"; in North Korean , "Fatherland Liberation War"; 25 June 1950 – 27 July 1953) Answer: 25 June 1950
[EX A]: When did the war begin that prompted the Navy to build the airport?

[EX Q]: Context: At the top of this hill, the street passes west of Link Information: none Answer: none
[EX A]: How many students are enrolled at the school at the top of the hill?

[EX Q]: Context: The Kepler spacecraft, which was launched by a Delta II on 7 March, entered an Earth-trailing heliocentric orbit from where it will search for exoplanets. On 14 May, and Ariane 5ECA launched the Herschel and Planck spacecraft. Link Information: none Answer: none
[EX A]:
Which spacecraft out of the Kepler, Hershel and Planck spacecrafts was the most expensive to build?