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 : Cristina Dinu (born 18 January 1993 in Bucharest) is a professional Romanian tennis player. 
Question : What city is Cristina Dinu associated with?

Output: residence


Input: Consider Input: Context : Christian de Boissieu received a Ph. D in economics in 1973 at the University of Paris-I Panthéon-Sorbonne. 
Question : What is the name university that educated Christian de Boissieu?

Output: educated at


Input: Consider Input: Context : In 1961, the first M79 grenade launchers were delivered to the US Army. 
Question : What was the year M79 grenade launcher entered service?


Output: service entry