Classify the relation of question with context to one of these categories: 1) award received, 2) based on, collection, 3) conflict, 4) constellation, 5) convicted of, 6) date of death, 7) director, 8) drafted by, 9) educated at, 10) medical condition, 11) military branch, 12) narrative location, 13) occupation, 14) original network, 15) parent company, 16) point in time, 17) production company, 18) residence, 19) series, 20) service entry, 21) sex or gender, 22) spouse, 23) standards body question.

[Q]: Context : Designated MA-31 in US service, the first launch of the missile took place in August 1996. 
Question : In which year was the service entry date for MA-31?
[A]: service entry


[Q]: Context : Eyes Wide Shut is a 1999 erotic thriller film based on Arthur Schnitzler's 1926 novella Traumnovelle (Dream Story) transferred from early 20th century Vienna to 1990s New York. 
Question : The Eyes Wide Shut is based upon what?
[A]: based on


[Q]: Context : The Hanging Tree is a 1959 Technicolor film directed by Delmer Daves. 
Question : The main director of The Hanging Tree was who?
[A]:
director