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: 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: poisonous darts are used for defense by sea anemones, Fact2: Sea anemones are related to jellyfish and coral., Question: what are used for defense by an organism related to jellyfish and coral (A) poisonous darts (B) Chemicals (C) specialized (D) by parasitizing them (E) chondrocytes (F) flagella (G) Microscopic vessels. (H) a sponge
[EX A]: A

[EX Q]: Fact1: boiling means change from a liquid into a gas by adding heat energy, Fact2: Gas is the source of energy for heating water and for the stove., Question: What heats water for boiling? (A) water (B) ice (C) magnets (D) Heat (E) ligt (F) fire (G) gas (H) salt
[EX A]:
G