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 : June 1942, the Aichi H9A was employed in a variety of second-line roles, including anti-submarine missions along the Japanese coasts, transport, paratroop training and liaison. 
Question : What was the year that Aichi H9A entered service?
[A]: service entry


[Q]: Context : Her mother later married actor John Southall, by whom she had a daughter, Georganne Southall, Cher's half-sister. 
Question : What is Cher's spouse's name?
[A]: spouse


[Q]: Context : ``The Cartridge Family'' is the fifth episode of The Simpsons' ninth season, which originally aired on Fox in the United States on November 2, 1997. 
Question : What series is the episode The Cartridge Family part of?
[A]:
series