What is the relationship between Unibanco and bank 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.

With US$493.78 billion in assets as of June 30, Banco do Brasil SA, is the region's largest bank by almost US$100 billion, followed by Itaú Unibanco Holding SA with US$396.12 billion in assets.

Answer: product_or_material_produced