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 : Rudolf Witzig re-joined the military service in the newly created Bundeswehr of the Federal Republic of Germany on 16 January 1956. 
Subject : Rudolf Witzig 
Relation : conflict
What war did Rudolf Witzig participate in?

Context : The Van Gogh Museum's Wheatfield with Crows was painted in July 1890, in the last weeks of van Gogh's life. 
Subject : Wheatfield with Crows 
Relation : collection
What is the name of the place where Wheatfield with Crows can be found?

Context : My Friend Rabbit is a children's picture book written and illustrated by Eric Rohmann. 
Subject : My Friend Rabbit 
Relation : original network

On what channel did My Friend Rabbit first appear?