Analyze the relationship between 'BG Group' and 'Royal Dutch Shell' within the context of the input sentence.
Options: parent organization, currency, distribution format, original broadcaster

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.)
parent organization