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 : In 622, the year of Muhammad's migration to Yathrib (now Medina), Ali risked his life by sleeping in Muhammad's bed to impersonate him and thwart an assassination plot so that Muhammad could escape in safety. 
Question : What is Ali's spouse's name?

SOLUTION: spouse

PROBLEM: Context : Designated MA-31 in US service, the first launch of the missile took place in August 1996. 
Question : In which year was the service entry date for MA-31?

SOLUTION: service entry

PROBLEM: Context : Peder Paulsen Balke was born in Østre Toten in Oppland, Norway. 
Question : What kind of  occupation does Peder Paulsen Balke have?

SOLUTION:
occupation