Stream of consciousness rationale: Shark are there in deep ocean. sharks going down in dark water means it is in deep ocean.
The question and answer pair are described below.

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
Q: The shark followed the fish down into the dark water, where did the shark go?
Options:
- the desert
- sea world
- great outdoors
- deep ocean
- maritime museum
A: deep ocean