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 : 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?

Ex Output:
convicted of


Ex Input:
Context : Directed by Tom Cherones, ``The Ex-Girlfriend'' was the first episode of the show filmed at CBS Studio Center in Los Angeles, California, the previous season having been filmed at Desilu Cahuenga in Hollywood. 
Question : What series is The Ex-Girlfriend from?

Ex Output:
series


Ex Input:
Context : The Davidka (Yiddish: דוידקה‎, ``Little David'') was a homemade Israeli mortar used in Safed and Jerusalem during the early stages of the 1948 Israeli War of Independence. 
Question : What was the year Davidka entered service?

Ex Output:

service entry