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.

The three largest oil companies BP, Royal Dutch Shell (LSE: RDSB.L - news ) and BG Group (LSE: BG.L - news ) alone make up 13.3pc of the index by weight.

Answer: parent_organization