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.

[Q]: Context : The Hanging Tree is a 1959 Technicolor film directed by Delmer Daves. 
Subject : The Hanging Tree 
Relation : director
[A]: The main director of The Hanging Tree was who?


[Q]: Context : Lead Balloon is a British television series produced by Open Mike Productions for BBC Four. 
Subject : Lead Balloon 
Relation : original network
[A]: Which channel broadcast Lead Balloon?


[Q]: Context : CBC Film Festival is a Canadian feature film television series which aired on CBC Television from 1979 to 1980. 
Subject : CBC Film Festival 
Relation : original network
[A]:
What network did CBC Film Festival air on?