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.

Category: PHILOSOPHY 
Clue: It's the study of the principles of reasoning
logic

Category: POTPOURRI 
Clue: Goto is the surname of the young Osaka-born violinist known by this single name
midori

Category: THE ONE & ONLY 
Clue: He was the one & only U.S. president to take the oath of office aboard an airplane

lyndon johnson