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 consistency, answers should be in all lower cased letters.

Category: THE NEAREST 
Clue: ...of your 4 limbs to your heart is this one
your left arm

Category: DOUBLE DOUBLE LETTERS 
Clue: A gathering at which Pete Seeger & Joan Baez, or an owl & a goat might sing
hootenanny

Category: ORIGINS 
Clue: This count introduced the potato as food to Lombardy & the battery to the world

alessandro volta