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.

Context : Oliver Otis Howard (November 8, 1830 -- October 26, 1909) was a career United States Army officer and a Union general in the American Civil War. 
Question : In which war/battle did Oliver Otis Howard fight?
conflict

Context : Ernesto Ambrosini (29 September 1894 -- 4 November 1951) was an Italian athlete who competed mainly in the 3000 metres steeplechase. 
Question : The death of Ernesto Ambrosini occured on what date?
date of death

Context : Plan 9 from User Space (also plan9port or p9p) is a port of many Plan 9 from Bell Labs libraries and applications to Unix-like operating systems. 
Question : The Plan 9 from User Space is based upon what?

based on