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.

Ex Input:
Context : The Paveway IV entered service with the Royal Navy in 2008. 
Question : Which was the official year for the approval of Paveway IV?

Ex Output:
service entry


Ex Input:
Context : Irene Riano (1871-1940) was a British stage actress. 
Question : What was the date of death of Irene Riano?

Ex Output:
date of death


Ex Input:
Context : Juwayriyya bint al-Harith (Arabic: جويرية بنت الحارث‎ juwayriyya bint al-ḥārith, born c. 608) was a wife of Muhammad and a Mother of the Believers. 
Question : What is Juwayriyya bint al-Harith's spouse's name?

Ex Output:

spouse