Peter Atherton, analyst at Jefferies investment bank, said that the cost to take control of just the UK assets of companies, which include British Gas owner Centrica and network operator National Grid, would drain about £124bn from the nation's coffers.
Utilize the input text as a context reference, choose the right relationship between 'British Gas' and 'Centrica' from the options.
Options: owned by, distribution format, founded by, industry