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: BACK TO BUSINESS 
Clue: No-contract & pay as you go plans are selling points of this cell phone company started by Sir Richard Branson

Answer: virgin mobile


Question: Category: WORLD RELIGION 
Clue: Inti was the sun god prayed to by the ruling family of this South American empire

Answer: incas


Question: Category: BESTSELLERS 
Clue: In 2011 this son of a president published the moving memoir "My Father at 100"

Answer:
ronald reagan jr.