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 : Messier 99 was discovered by Pierre Méchain on March 17, 1781 along . 
Question : What constellation is Messier 99 in?

SOLUTION: constellation

PROBLEM: Context : Beyond the Poseidon Adventure is a 1979 American adventure film, a sequel to the 1972 film The Poseidon Adventure. 
Question : Which is the basis of Beyond the Poseidon Adventure?

SOLUTION: based on

PROBLEM: Context : Biggles has an unusually lengthy career, flying a number of aircraft representative of the history of British military aviation, from Sopwith Camels during World War I, Hawker Hurricanes and Supermarine Spitfires in World War II, right up to the Hawker Hunter jet fighter in a postwar adventure Biggles in the Terai. 
Question : What organization was Biggles involved with?

SOLUTION:
military branch