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 : Le Corsaire is a ballet typically presented in three acts, with a libretto originally created by Jules-Henri Vernoy de Saint-Georges loosely based on the poem The Corsair by Lord Byron. 
Question : The Le Corsaire is based upon what?

SOLUTION: based on

PROBLEM: Context : As of 2011, QI is distributed by FremantleMedia. 
Question : Which production company is involved with QI?

SOLUTION:
production company