What is the relationship between Mattel and Barbie 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.

Worldwide sales for Mattel girls and boys brands fell 3 percent in constant currency to $601.8 million, with sales for the Barbie brand were down 11 percent.

Answer: owner_of