What is the relationship between CENTRICA and energy supply in the context of the input sentence. Choose an answer from: product/material produced; manufacturer; distributed by; industry; position held; original broadcaster; owned by; founded by; distribution format; headquarters location; stock exchange; currency; parent organization; chief executive officer; director/manager; owner of; operator; member of; employer; chairperson; platform; subsidiary; legal form; publisher; developer; brand; business division; location of formation; creator.

* CENTRICA - Britain's largest utility will sell up to 1 billion pounds worth of upstream and wind assets by 2017 and reduce net headcount by around 4,000 staff in a strategy shift that will see it put more emphasis on energy supply and services.

Answer: industry