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 : ``Bart the Genius'' is the second episode of The Simpsons' first season, which originally aired on the Fox network on January 14, 1990. 
Subject : Bart the Genius 
Relation : series
What series is Bart the Genius part of?

Context : The Thompson submachine gun is an American submachine gun, invented by John T. Thompson in 1918, that became infamous during the Prohibition era. 
Subject : Thompson submachine gun 
Relation : service entry
What year was the service entry date for Thompson submachine gun?

Context : Arwen was the youngest child of Elrond and Celebrían. 
Subject : Arwen 
Relation : spouse

What is Arwen's spouse's name?