What is the relationship between Berkshire Hathaway and insurance 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.

Berkshire Hathaway is a long-standing supporter of the reinsurance business, which sells protection to traditional insurance firms to spread the risk of large claims, such as hurricane damage or aviation disasters.

Answer: industry