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.
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Question: Category: HISTORIC QUOTES 
Clue: This great Prussian king is credited with saying, "An army, like a serpent, travels on its belly"

Answer: frederick the great


Question: Category: LET'S GET MEDICAL 
Clue: Amyotrophic lateral sclerosis, also known as his disease, claimed his life in 1941

Answer: lou gehrig


Question: Category: THE NEW YORK TIMES OP-ED PAGE 
Clue: In political & journalistic circles, this op-edder's fame is such that she's simply called MoDo

Answer:
maureen dowd