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 simplicity, answers should be in all lower cased letters.
question:
Category: FORWARDS & BACK WORDS 
Clue: Shrek & "therefore" (follows "cogito")
answer:
ogre & ergo


question:
Category: UNCIVIL UNREST 
Clue: "This is the farewell kiss, you dog", said Muntader al-Zaidi as he threw both of these at Pres. Bush in Dec. 2008
answer:
his shoes


question:
Category: ASTRONOMY 
Clue: Tycho, one of these on the moon, can be seen without a telescope
answer:

crater