Definition: In this task, you are given two facts, and a multiple-choice question. Based on the given facts, answer the question with index of the correct option (e.g, "A").
Input: Fact1: Echinoderms lack a centralized nervous system., Fact2: Echinoderms are represented by the starfish., Question: What kind of animal doesn't have a centralized nervous system? (A) dog (B) mammals (C) cows (D) bird (E) human (F) elephants (G) starfish (H) a fish
Output:
G