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.
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Question: 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?

Answer: educated at


Question: Context : ISO 3166-2:NG is the entry for Nigeria in ISO 3166-2, part of the ISO 3166 standard published by the International Organization for Standardization (ISO), which defines codes for the names of the principal subdivisions (e.g., provinces or states) of all countries coded in ISO 3166-1. 
Question : Who set the standards for ISO 3166-2:NG?

Answer: standards body


Question: Context : Messier 105 was discovered by Pierre Méchain on 24 March 1781, just a few days after he discovered the nearby galaxies Messier 95 and Messier 96. 
Question : Which constellation is formed by Messier 105?

Answer:
constellation