Q: 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").
Fact1: Echinoderms use pheromones to communicate with each other., Fact2: Scent marks contain molecules called pheromones., Question: What do echinoderms use to communicate? (A) vision (B) words (C) sound (D) Light (E) waves (F) Acids (G) language (H) scent
A:
H