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 : After the match, Li Na was praised by the Chinese media, and her popularity throughout China was expected to grow significantly in the coming months, as she became the first Chinese national, male or female, ever to win a tennis Grand Slam title in singles, ensuring her place in the sport's history. 
Question : What city is Li Na from?

Ex Output:
residence


Ex Input:
Context : The Gewehr 98 (abbreviated G98, Gew 98 or M98) is a German bolt-action Mauser rifle firing cartridges from a 5-round internal clip-loaded magazine that was the German service rifle from 1898 to 1935, when it was replaced by the Karabiner 98k. 
Question : What year did Gewehr 98 come into use?

Ex Output:
service entry


Ex Input:
Context : The Buk missile system (Russian: ``Бук''; ``beech'' (tree), /bʊk/) is a family of self-propelled, medium-range surface-to-air missile systems developed by the Soviet Union and its successor state, the Russian Federation, and designed to fight cruise missiles, smart bombs, fixed- and rotary-wing aircraft, and unmanned aerial vehicles. 
Question : What was the year that Buk missile system entered service?

Ex Output:

service entry