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 : On 4 November 2010, Qantas Flight 32, an Airbus A380 registered VH-OQA, fitted with four Trent 972 engines manufactured by Rolls-Royce, suffered an uncontained turbine disc failure of its left inboard engine shortly after taking off from Singapore Changi Airport en route to Sydney. 
Question : What is Qantas's parent company?

SOLUTION: parent company

PROBLEM: Context : Æthelswith (c. 838-888) was the only known daughter of King Æthelwulf of Wessex. 
Question : What is Æthelswith's spouse's name?

SOLUTION: spouse

PROBLEM: Context : Texaco was an independent company until its refining operations merged into Chevron Corporation in 2001, at which time most of its station franchises were divested to the Shell Oil Company. 
Question : What company is Texaco part of?

SOLUTION:
parent company