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 consistency, answers should be in all lower cased letters.

Input: Consider Input: Category: SCIENCE GRAB BAG 
Clue: A material called URhGe can be manipulated into being this, lacking electrical resistance

Output: superconductors


Input: Consider Input: Category: CURRENT EXPRESSIONS 
Clue: If you're engaging in wishful thinking, you may want to perform this type of "check"

Output: a reality check


Input: Consider Input: Category: SCIENCE 
Clue: Pre-Y1K scientists figured this organ gave out light; they were, of course, wrong


Output: eye