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: WORLD GEOGRAPHY 
Clue: The Lusatian Mountains, in the western Sudeten range, form part of the border between these 2 countries
germany & the czech republic

Category: U.S. PRESIDENTS 
Clue: Adventurous 26th president, he was 1st to ride in an automobile & an airplane
theodore roosevelt

Category: LONDON LANDMARKS 
Clue: A statue of him stands outside the London Underground Baker Street station

sherlock holmes