Utilize the input text as a context reference, choose the right relationship between Whopper and Burger King from the options. Options: 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