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.

447.80p -0.71% Standard Chartered (HKSE: 2888.HK - news ) (STAN) 864.80p -0.61% Royal Dutch Shell 'B' (RDSB) 1,826.00p -0.41% Royal Dutch Shell 'A' (RDSA) 1,814.50p -0.38% BG Group (LSE: BG.L - news ) (BG.)

Answer: parent_organization