Answer the following question, with explanation first.
Echinoderms are resistant to some:\nOptions:\n- (A) starfish\n- (B) enzymes\n- (C) Toxicity\n- (D) pesticide\n- (E) parasites\n- (F) toxins\n- (G) boats\n- (H) chemicals

(F)
Echinoderms lack a centralized nervous system.

From animal experiments, it seems to be a central nervous system toxin.

Echinoderms are resistant to some toxins.

.

Final answer: (F)