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: telephones are used for communication by two people by transmitting sound, Fact2: And the sound of their voice becomes important as well., Question: What is transmitted with telephones? (A) voice (B) copper (C) waves (D) smell (E) cancer (F) energy (G) HIV (H) power
[EX A]: A

[EX Q]: Fact1: a greenhouse is used to protect plants from the cold, Fact2: Plants are very easily raised from seed, sown in a cold greenhouse from February to April., Question: What does a greenhouse protect plants from to help them grow easily? (A) death (B) hotness (C) Winter (D) fronts (E) heat (F) drought (G) rain (H) chill
[EX A]: H

[EX Q]: Fact1: microorganisms can cause infections, Fact2: Chlorination uses liquid chlorine bleach to kill microorganisms., Question: Which chemical added to water prevents illnesses?  (A) Glucose (B) evaporation (C) Chlorine. (D) sugar (E) Allergies (F) sweating (G) energy (H) hydration
[EX A]:
C