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.

The heart of Warren Buffett's Berkshire Hathaway lies in insurance and finance, but a string of massive industrial deals have shifted the balance of the conglomerate's holdings toward industrial and manufacturing firms.

Answer: industry