Input: which chemical makes it possible for a photograph to be exposed to be open to white light?

Output: silver halide

Input: who is the rooster in the alice in chains song?

Output: Jerry Cantrell Sr.

Input: where does the phrase for whom the bell tolls come from?

Output: Devotions upon Emergent Occasions

Input: who played the grand nagus on deep space nine?

Output:
Wallace Michael Shawn