What is the relationship between 'Yum Brands' and 'Pizza Hut' in the context of the input sentence.
Options: subsidiary, product/material produced, location of formation, position held

Aug 18 (Reuters) - Yum Brands Inc on Tuesday announced new leadership for its China business as investor activists lobby for the owner of the KFC and Pizza Hut brands to spin off that business, which is its biggest driver of revenue and profit.
subsidiary