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.

Context : ISO 3166-2:BN is the entry for Brunei 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:BN?
standards body

Context : One night, however, Laius was drunk and fathered Oedipus with her. 
Question : What is Laius's spouse's name?
spouse

Context : At 0930 hours on 15 May 1918, Oberleutnant Walter Ewers was killed in action while piloting his Albatros D.V in combat over Villers-Bretonneux with No. 65 Squadron RAF. 
Question : Which war did Walter Ewers participate in?

conflict