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.

Q: Context : Preparing for a Fancy Dress Ball, also known as The Misses Williams-Wynn, is a 173 by 150 cm (68 by 59 in) oil on canvas by English artist William Etty, first exhibited in 1835 and currently in the York Art Gallery. 
Answer : York Art Gallery

A: What is the name of the place where Preparing for a Fancy Dress Ball can be found?
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Q: Context : Walter Grabmann (20 September 1905 -- 20 August 1992) was a German World War II Luftwaffe Generalmajor. 
Answer : World War II

A: In which war did Walter Grabmann participate?
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Q: Context : Saadi Lahlou is Professor in Social Psychology, in the Department of Social Psychology at the London School of Economics. 
Answer : London School of Economics

A:
What is Saadi Lahlou's place of employment?
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