Context: Opalescent nudibranchs have stinging cells in their brightly colored skin. The bright colors serve as a warning sign that the animal is toxic and dangerous. The 's skin is adapted to ward off predators.
Figure: opalescent nudibranch.
Which animal's skin is better adapted as a warning sign to ward off predators?
A. fire salamander
B. fantastic leaf-tailed gecko
Answer with the option's letter from the given choices directly.

A