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 : Caleb Powers (February 1, 1869 -- July 25, 1932) was a United States Representative from Kentucky and the first Secretary of State of Kentucky convicted as an accessory to murder. 
Question : For what crime was Caleb Powers prosecuted?
convicted of

Context : Kivalliq Air, the scheduled airline division of Keewatin Air, began operations in December 1999. 
Question : Which company is the parent company of Kivalliq Air?
parent company

Context : Leon Ehrenpreis (May 22, 1930 - August 16, 2010, Brooklyn) was a mathematician at Temple University who proved the Malgrange-- 
Question : What was Leon Ehrenpreis's occupation?

occupation