What is the relationship between Cigna and health 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.

Insurer Anthem sealed a $54.2 billion deal to buy rival Cigna (NYSE: CI - news ) , in a further consolidation of the US health insurance industry in the wake of the US Affordable Care Act.
product_or_material_produced