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 : 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?

Ex Output:
educated at


Ex Input:
Context : Nabisco opened corporate offices as the National Biscuit Company in the world's first skyscraper, the Home Insurance Building in the Chicago Loop in 1898. 
Question : What is Nabisco's parent company?

Ex Output:
parent company


Ex Input:
Context : Braathens merged with SAS Norway on 1 May 2004. 
Question : Which company is the parent company of Braathens?

Ex Output:

parent company