What is the relationship between Direct Line 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.

Admiral Group (LSE: ADM), Direct Line (LSE: DLG), Aviva (LSE: AV) and RSA Insurance Group (LSE: RSA) are some of the UK's largest motor insurers.

Answer: product_or_material_produced