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 Q]: Context : Teacher Didn't Tell Me is a British television series which aired on the BBC during 1957. 
Question : What production company or companies created Teacher Didn't Tell Me?
[EX A]: production company

[EX Q]: Context : Nightbreed (also Night Breed on publicity material, or Clive Barker's Nightbreed) is a 1990 American dark fantasy horror film written and directed by Clive Barker, based on his 1988 novella Cabal, and starring Craig Sheffer, Anne Bobby, David Cronenberg, Charles Haid, Hugh Quarshie, and Doug Bradley. 
Question : The Nightbreed is based upon what?
[EX A]: based on

[EX Q]: Context : Li Na (born 26 February 1982) is a Chinese former professional tennis player, who achieved a career-high ranking of world No. 2 on the WTA Tour on 17 February 2014. 
Question : What city is Li Na from?
[EX A]:
residence