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.

Example Input: Context : Erik Bruhn died in Toronto General Hospital on 1 April 1986 at the age of 57. 
Question : What sex is Erik Bruhn?
Example Output: sex or gender

Example Input: Context : Bonneville International was formed in 1964, with approval of the LDS Church's First Presidency. 
Question : Which company is the parent company of Bonneville International?
Example Output: parent company

Example Input: Context : In the 50s TV series Death Valley Days, hosted by Ronald Reagan, the story of Eadweard Muybridge's invention of the zoopraxiscope was told in the episode titled ``The $25,000 Wager'' Jim Morrison makes a reference to Muybridge in his poetry book The Lords (1969), suggesting that ``Muybridge derived his animal subjects from the Philadelphia Zoological Garden, male performers from the University''. 
Question : What date did Eadweard Muybridge die?
Example Output:
date of death