instruction:
You will be given a trivia clue, and the category it belongs to. You should answer with the best answer that belongs in the category and is described by the clue. For consistency, answers should be in all lower cased letters.
question:
Category: BUSINESS & INDUSTRY 
Clue: This package delivery firm was founded in 1907 as the American Messenger Company
answer:
ups


question:
Category: THAT'S NONE OF YOUR BUSINESS 
Clue: This fish-canning business famous for its mermaid is now owned by a Thai company
answer:
chicken of the sea


question:
Category: THE IMMUNE SYSTEM 
Clue: Natural killer cells target other cells that pose a danger, as in this, the No. 2 cause of death in the U.S.
answer:

cancer