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.

Q: Category: WALK INTO A "BAR" 
Clue: A pier, wharf or landing place: San Francisco has a famous one

A: embarcadero
****
Q: Category: "D" IN SCIENCE 
Clue: Sharks first inhabited the waters during this period of the Paleozoic era named for an English county

A: devonian
****
Q: Category: AMERICAN TRAFFIC SIGNS 
Clue: Bring extra batteries, this kind of exploring ahead

A:
cave exploring
****