A: Think of two well-known American cities, each five letters long. The first two letters of the first city are the state postal abbreviation of the second city. And the first two letters of the second city are the state postal abbreviation of the first city. What two cities are these?
What are you waiting for? Something here to lead you to the answer?
Edit: The hints were "what are" which sounds like "water" and "lead" referring to the metal.