Definition: 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.
Input: Context : White Banners is a 1938 Warner Bros. drama film starring Claude Rains, Fay Bainter, Jackie Cooper, Bonita Granville, Henry O'Neill, and Kay Johnson. 
Subject : White Banners 
Relation : production company
Output:

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
Which production company is involved with White Banners?