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: vinegar can cause harm to the eyes, Fact2: Vinegar is dilute acetic acid., Question: What can acetic acid do to the eyes? (A) treat cataracts (B) harm them (C) Relieve pain (D) Dehydration (E) kill them (F) hydrate them (G) protect them (H) cleanse them
[EX A]: B

[EX Q]: Fact1: Ants communicate with chemicals called pheromones., Fact2: Ants use receptors on their antennae to follow recruitment pheromone trails., Question: What do ants use to communicate? (A) nerves (B) heat energy (C) sound (D) binary code (E) light energy (F) Antennae. (G) megaphones (H) hand signals
[EX A]: F

[EX Q]: Fact1: smoking causes direct damage to the lungs, Fact2: When lung damage is experienced, frequently the total capacity of the respiratory system is reduced., Question: What can reduce respiratory system capacity? (A) Breathing (B) Smoking (C) influenza (D) bacteria (E) Pollution (F) Exercising (G) Pesticides (H) Singing
[EX A]:
B