Detailed Instructions: 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").
Problem:Fact1: Echinoderms use pheromones to communicate with each other., Fact2: Starfish and sea urchins are also echinoderms., Question: what uses pheromones to communicate with each other? (A) starfish (B) bees (C) bacteria (D) honeybees (E) density (F) humans (G) h2o (H) insects
Solution:
A