What is the relationship between Whopper and Burger King 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.

Burger King said that joining hands to make a combined version of its menu-topping Whopper burger and McDonald's icon, the Big Mac, would be a "powerful rallying call" in support of Peace One Day.

Answer: manufacturer