What unwanted creature would be found on the surface of a human body using it as a host? 
Options:
- (A) Tapeworm.
- (B) Leeches.
- (C) Pesticides
- (D) animals
- (E) insects
- (F) Hookworm
- (G) bacteria
- (H) Bracelet.
Hmmm, let me think. I don't want to be wrong, so I got to be careful.

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
Some parasites live on the surface of their host. Leeches are external parasites. Leeches are on the surface of the host . The answer: (B).