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 : Knights of Xentar is a humorous JRPG eroge (meaning it has erotic content). 
Question : To which series does Knights of Xentar belong?

A: series
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Q: Context : William de St Croix was educated at Eton and St John's College, Cambridge, graduating in 1843. 
Question : What university did William de St Croix attend?

A: educated at
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Q: Context : Antonio Selvaggio (born 1 January 1958 in Palermo) is a retired male long-distance runner from Italy. 
Question : What is the gender Antonio Selvaggio is known by?

A:
sex or gender
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