You will be given a context, a subject and a relation. Your task is to generate a question based on the subject and relation. The generated question should include the given subject. Try to use a minimum number of words that are not present in either context, subject or relation while generating question.

Context : The Yorkshire Mounted Brigade was a formation of the Territorial Force of the British Army, organised in 1908. 
Subject : Yorkshire Mounted Brigade 
Relation : military branch
What army did Yorkshire Mounted Brigade serve in?

Context : Henry Keogh (born 1954) is an Australian convicted of murder. 
Subject : Henry Keogh 
Relation : convicted of
For what crime was Henry Keogh prosecuted?

Context : Local Boy Makes Good is a 1931 American Pre-Code comedy film directed by Mervyn LeRoy and written by Robert Lord, Raymond Griffith and Ray Enright. 
Subject : Local Boy Makes Good 
Relation : director

The main director of Local Boy Makes Good was who?