TASK DEFINITION: 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.
PROBLEM: Context : The United Defense M42, sometimes known as the Marlin for the manufacturer, was an American submachine gun in World War II. It was produced from 1942 to 1943 by United Defense Supply Corp. (a government-formed company specifically tasked with weapons development) for possible issue as a replacement for the Thompson submachine gun and was used by agents of the Office of Strategic Services (OSS). 
Question : In what year did United Defense M42 enter service?

SOLUTION: service entry

PROBLEM: Context : The Esterhazy Madonna is a 1508 painting by Raphael, held at the Museum of Fine Arts in Budapest, in Hungary. 
Question : What is the name of the place where Esterhazy Madonna can be found?

SOLUTION: collection

PROBLEM: Context : Daniela Schadt (born 3 January 1960 in Hanau, West Germany) is a German journalist, and, since 2000, the domestic partner of Joachim Gauck, the President of Germany, who has been legally married since 1959 to Gerhild Radtke. 
Question : What is Daniela Schadt's spouse's name?

SOLUTION:
spouse