In the context of the input sentence, determine the relationship between 'BG Group' and 'Royal Dutch Shell'.
Options: chief executive officer, headquarters location, industry, parent organization

389.55p +1.05% Royal Dutch Shell (Xetra: R6C1.DE - news ) 'B' (RDSB) 1,906.00p +0.69% Royal Dutch Shell 'A' (RDSA) 1,892.00p +0.67% BG Group (LSE: BG.L - news ) (BG.)
parent organization