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: GEOLOGISTS 
Clue: In 1957 Sir Vivian Fuchs led the first crossing of this continent; it took 99 days

Answer: antarctica


Question: Category: TELEVISION 
Clue: Ray Walston was the Martian while the "my" in "My Favorite Martian" referred to him

Answer: bill bixby


Question: Category: ALL'S PHARAOH 
Clue: After this man died in 323 B.C., Ptolemy, one of his generals, declared himself Pharaoh

Answer:
alexander the great