What is the relationship between BETFAIR and Online gambling 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.

* BETFAIR - Online gambling company Betfair and Irish rival Paddy Power said on Wednesday they had reached an agreement in principle on a possible merger, marking the latest in a string of possible tie-ups across the sector.

Answer: industry