What is the relationship between BG Group and Royal Dutch Shell in the context of the input sentence. Choose an answer from: product/material produced; manufacturer; distributed by; industry; position held; original broadcaster; owned by; founded by; distribution format; headquarters location; stock exchange; currency; parent organization; chief executive officer; director/manager; owner of; operator; member of; employer; chairperson; platform; subsidiary; legal form; publisher; developer; brand; business division; location of formation; creator.

Glencore rose the most, up 3.2 percent, with fellow miner BHP Billiton (NYSE: BBL - news ) also among the biggest gainers, while energy companies BG Group (LSE: BG.L - news ) and Royal Dutch Shell (Xetra: R6C1.DE - news ) climbed 2.3 and 1.3 percent respectively.

Answer: parent_organization