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.
Take context from the input text and decide on the accurate relationship between 'British Gas' and 'Centrica' from the options provided.
Options: founded by, industry, owned by, distribution format