Teacher:Generate a question which can yield the answer mentioned in the input. Generated question must be answered by the answer provided in input, without using any extra knowledge.
Teacher: Now, understand the problem? Solve this instance: Context : General Sir Alexander Frank Philip Christison, 4th Baronet GBE, CB, DSO, MC & Bar (17 November 1893 -- 21 December 1993) was a British Army commander of the Second World War.
Answer : British Army
Student:
What army did Philip Christison serve in?