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 simplicity, answers should be in all lower cased letters.

Category: VERBS 
Clue: Rotate a movie camera or give a bad review to the finished film
pan

Category: THE AMERICAN REVOLUTION 
Clue: In 1780 & '81 this general commanded Britain's forces in the southern colonies
lord cornwallis

Category: PLANTS & TREES 
Clue: Closely related to the Saguaro, night-blooming Cereus is a type of this plant

a cactus