instruction:
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.
question:
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
answer:
The date of China Airlines Flight 642 was what?


question:
Context : Voice from the Grave, also known as From the Files of Unsolved Mysteries: 
Subject : Voice from the Grave 
Relation : based on
answer:
Which is the basis of Voice from the Grave?


question:
Context : The lMG 08 and lMG 08/15 guns would always be used on fixed-wing aircraft, as fixed forward-aimed synchronized firing ordnance initially in single mounts for Germany's 1915-16 era Fokker Eindecker and Halberstadt D.II ``scout'' single-seat fighters, and by 1916 in dual mounts, first appearing on the mass-produced examples of Robert Thelen's Albatros D.I and D.II fighters in late 1916, and singly on German ``C-class'' armed two-seat observation aircraft for synchronized forward-firing armament. 
Subject : MG 08 
Relation : service entry
answer:

In which year was the service entry date for MG 08?


