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 : Since 1998, GSD&M has been part of the Omnicom Group. 
Question : Which company is the parent company of GSD&M?
parent company

Context : Francesco Mangione is an Italian-born Australian, convicted of the murder of his 26-year-old cousin, Denis Giunta on 5 February 2002 in his Williamstown home. 
Question : For what crime was Francesco Mangione prosecuted?
convicted of

Context : Iron Dome (Hebrew: כִּפַּת בַּרְזֶל, kippat barzel) is a mobile all-weather air defense system developed by Rafael Advanced Defense Systems and Israel Aircraft Industries. 
Question : What year was Iron Dome made?

service entry