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: THE SOLAR SYSTEM 
Clue: The 2 planets in our solar system that have atmospheres made up mostly of carbon dioxide
venus & mars

Category: U.S. STATES 
Clue: With over 35,000 miles, this state has the longest highway system in the U.S.
texas

Category: WWII 
Clue: In English, it's the word that Mussolini was the first to use to describe the partnership between Berlin & Rome

axis