Given the task definition and input, reply with output. 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 : He pitched American Pop to Columbia Pictures president Dan Melnick. 
Subject : American Pop 
Relation : director

Who served as director for American Pop?