Q: Which of the following has the most complex nervous system?
Options:
- (A) animals
- (B) nerves
- (C) fur seals
- (D) humans
- (E) elephants
- (F) Jellyfish
- (G) bears
- (H) kalenchoes
A: (F)
Explain how we arrive at this answer: 
Explanation: Most invertebrates have a more complex nervous system. Jellyfish and insects are invertebrates. Jellyfish have a more complex nervous system.