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").

[EX Q]: Fact1: Evolution is a change in the characteristics of living things over time., Fact2: Evolution relies on random chance acts to cause mutations., Question: What causes changes in characteristics of living things over time? (A) mutations (B) science (C) parents (D) environment (E) light energy (F) news (G) alleles (H) animals
[EX A]: A

[EX Q]: Fact1: Echinoderms use pheromones to communicate with each other., Fact2: All echinoderms are deuterostomes ., Question: What use pheromones to communicate with each other? (A) passenger pigeons (B) honeybees (C) deuterostomes (D) Most plants (E) insects (F) animals (G) huddle together (H) orchids
[EX A]: C

[EX Q]: Fact1: Fungi have special structures for penetrating a host., Fact2: Parasitic plants and fungi can attack animals., Question: What do some parasitic creatures have special structures for? (A) Making friends (B) produce offspring (C) sensory neurons (D) protect them (E) Penetrate animals (F) Building sheds (G) Learning facts (H) resistance
[EX A]:
E