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 : Timelike Infinity is a 1992 science fiction book by Stephen Baxter. 
Question : What series is Timelike Infinity a part of?

A: series
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Q: Context : Margo Johns (1919 -- 29 September 2009) was a British actress and the first wife of actor William Franklyn. 
Question : What is Margo Johns's spouse's name?

A: spouse
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Q: Context : After receiving feedback from users and incorporating the several design changes requested, including adapting the rifle for use with the heavier Belgian SS109 version of the 5.56×45mm round and improving reliability, the weapon system was accepted into service with the British Army in 1985 as the SA80. 
Question : What was the year that SA80 entered service?

A:
service entry
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