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: HANNA-BARBERA DOGS 
Clue: In one episode of the original "Jetsons", a millionaire tried to take him away

Answer: astro


Question: Category: CHEMISTRY 
Clue: It's a system of small particles "hanging" in a liquid; paint, for example

Answer: suspension


Question: Category: STATION 
Clue: On January 1, 1892 this receiving station for immigrants in Upper N.Y. Bay opened its doors for the first time

Answer:
ellis island