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.

Context : After TUI UK merged with First Choice Holidays in September 2007, it became part of TUI Travel PLC. The new holiday company continued with both in-house airlines (Thomsonfly and First Choice Airways) through Winter 2007 and Summer 2008 until the two were merged on 1 November 2008 as Thomson Airways. 
Question : What is Thomsonfly's parent company?
parent company

Context : Rocky Barton (July 28, 1956 -- July 12, 2006) was executed by the State of Ohio on July 12, 2006 for the murder of his wife, 43-year-old Kimbirli Jo Barton, at their home in Waynesville, Ohio. 
Question : For what crime was Rocky Barton prosecuted?
convicted of

Context : The Portrait of Francesco delle Opere is a painting by the Italian Renaissance artist Perugino, dating to 1494 and housed in the Uffizi Gallery, Florence. 
Question : What is the name of the place where Portrait of Francesco delle Opere can be found?

collection