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: DR. WHO...
Clue: specializes in X-rays & elements, like the one with the atomic number 88 for treating diseases

Answer: a radiologist

Question: Category: MATH & SCIENCE
Clue: Around 1850 George Boole devised a new take on this branch of math

Answer: algebra

Question: Category: INCLUDES A PAPAL NAME
Clue: Founded in 1970, the name of this "lifestyle-specific" hipster store means "city clothiers"

Answer:
urban outfitters