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.

Input: Consider Input: Context : Norway - Upgraded to NASAMS 2. 
Question : Which was the official year for the approval of NASAMS?

Output: service entry


Input: Consider Input: Context : General Sir William Gabriel Davy, KCH (1780 -- 25 January 1856) was a British Army officer who fought in the Peninsular War. 
Question : Which war was William Gabriel Davy a part of?

Output: conflict


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


Output: series