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").

Example Input: Fact1: matter vibrating can cause sound, Fact2: Thus, sound is a wave in air ., Question: what can matter vibrating cause? (A) Pollution (B) energy (C) Relieve pain (D) kinetic energy (E) wave in air (F) Energy. (G) murmur (H) Greenhouse gases
Example Output: E

Example Input: Fact1: Feathers help birds fly and provide insulation., Fact2: Some birds are flightless birds., Question: Why do the flightless have feathers? (A) layers of fat (B) Sublimation (C) it needs them (D) warm-blooded (E) Air conditioning (F) Radiation (G) Insulation (H) protect them
Example Output: G

Example Input: Fact1: Some viruses live in a dormant state inside the body., Fact2: Cold and flu symptoms are the result of the body s response to the virus., Question: Some viruses live in a dormant state with cold and flu what? (A) dormant series (B) resistance (C) dehydration (D) discoveries (E) studies (F) illness (G) parasites (H) symptoms
Example Output:
H