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.
Utilize the input text as a context reference, choose the right relationship between 'BG Group' and 'Royal Dutch Shell' from the options.
Options: founded by, parent organization, member of, owner of