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 : China Airlines Flight 642 was a flight that crashed at Hong Kong International Airport on 22 August 1999. 
Subject : China Airlines Flight 642 
Relation : point in time
Example Output: The date of China Airlines Flight 642 was what?

Example Input: Context : The Yorkshire Mounted Brigade was a formation of the Territorial Force of the British Army, organised in 1908. 
Subject : Yorkshire Mounted Brigade 
Relation : military branch
Example Output: What army did Yorkshire Mounted Brigade serve in?

Example Input: Context : Davor Čebron (born 24 March 1986) is a Slovenian male former volleyball player. 
Subject : Davor Čebron 
Relation : sex or gender
Example Output:
What was the gender of Davor Čebron?