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: MIDDLE INITIAL V. 
Clue: This current world leader's middle initial V. stands for Vladimirovich

Answer: vladimir putin


Question: Category: THE WHITE HOUSE 
Clue: When electric lights were installed in 1891, this pres., afraid of being shocked, wouldn't operate the switches

Answer: benjamin harrison


Question: Category: SCIENCE BRIEFS 
Clue: Traveling 1 astronomical unit from the sun, you should just reach this planet

Answer:
earth