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: THE YOU-NIVERSE 
Clue: Containing 33 vertebrae, it's also known as the vertebral column

Answer: the spine


Question: Category: "R"ITERS 
Clue: This author of the hitchhiking novel "Even Cowgirls Get the Blues" once hitchhiked across the U.S.

Answer: tom robbins


Question: Category: TRAVEL & TOURISM 
Clue: Hotels in this city include the Holiday Inn On The Bay, The Pan Pacific Hotel & the Balboa Park Inn

Answer:
san diego