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 : June 1942, the Aichi H9A was employed in a variety of second-line roles, including anti-submarine missions along the Japanese coasts, transport, paratroop training and liaison. 
Question : What was the year that Aichi H9A entered service?
service entry

Context : Bored of the Rings is a parody of J. R. R. Tolkien's The Lord of the Rings. 
Question : Which is the basis of Bored of the Rings?
based on

Context : He was the father of Emmett Louis Till, whose murder in 1955 at the age of 14 galvanized the African-American civil rights movement. 
Question : For what crime was Louis Till prosecuted?

convicted of