instruction:
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.
question:
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?
answer:
parent company


question:
Context : Elections to the European Parliament were held in Belgium on June 13, 2004. 
Question : When did Elections to the European Parliament occurr?
answer:
point in time


question:
Context : ``The Post-Modern Prometheus'' is the fifth episode of the fifth season of the American science fiction television series The X-Files and originally aired on the Fox network on November 30, 1997. 
Question : Who directed The Post-Modern Prometheus?
answer:

director