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.

Example Input: Context : Judy Dater is an American photographer and feminist. 
Subject : Judy Dater 
Relation : sex or gender
Example Output: What is the sex of Judy Dater?

Example Input: Context : KLM Cityhopper is the regional subsidiary of KLM Royal Dutch Airlines (part of the Air France-KLM group). 
Subject : KLM Cityhopper 
Relation : parent company
Example Output: Which company is the parent company of KLM Cityhopper?

Example Input: Context : The Davidka (Yiddish: דוידקה‎, ``Little David'') was a homemade Israeli mortar used in Safed and Jerusalem during the early stages of the 1948 Israeli War of Independence. 
Subject : Davidka 
Relation : service entry
Example Output:
What was the year Davidka entered service?