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 : In October 2014, Harvest Rain Theatre Company under the direction of producer Tim O'Connor staged a production of Spamalot with a cast list including Jon English as King Arthur, Simon Gallaher as Patsy, Julie Anthony as The Lady Of The Lake, and Frank Woodley as Sir Robin.
Subject : Spamalot
Relation : based on
Which is the basis of Spamalot?