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 : Timelike Infinity is a 1992 science fiction book by Stephen Baxter. 
Question : What series is Timelike Infinity a part of?

Ex Output:
series


Ex Input:
Context : Iain MacKintosh (20 July 1932 - 28 August 2006, Glasgow, Scotland) was a Scottish singer and songwriter. 
Question : What led to Iain MacKintosh's death?

Ex Output:
medical condition


Ex Input:
Context : The other games in the ``Gold Box'' series used the game engine pioneered in Pool of Radiance, as did later D&D titles such as the Neverwinter Nights online game. 
Question : The Pool of Radiance is based upon what?

Ex Output:

based on