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.
Take context from the input text and decide on the accurate relationship between 'Yum Brands' and 'KFC' from the options provided.
Options: subsidiary, legal form, currency, position held