TASK DEFINITION: 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.
PROBLEM: Category: BOTANY 
Clue: Cryptogams are not plants with secret meanings, but plants such as ferns that don't bear these

SOLUTION: seeds

PROBLEM: Category: BUSINESS & INDUSTRY 
Clue: This package delivery firm was founded in 1907 as the American Messenger Company

SOLUTION: ups

PROBLEM: Category: MONARCHS 
Clue: He was sent to Mexico in 1864 to set up an empire for Napoleon III

SOLUTION:
maximillian