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: LET'S DANCE 
Clue: Proverbially, "It Takes Two" to perform this Latin dance

A: tango
****
Q: Category: SUN 
Clue: In the main reaction making the sun's energy, 2 of these nuclear particles fuse & one becomes a neutron

A: protons
****
Q: Category: SEEING THE LIGHT 
Clue: Light can be interpreted either as particles called these or as waves called, uh, waves

A:
photons
****
