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: Flagella help prokaryotes move., Fact2: Most prokaryotes are unicellular., Question: What helps unicellular organisms move? (A) evaporation (B) bacteria (C) heat energy (D) glucose (E) sweating (F) flagella (G) legs (H) blood
Example Output: F

Example Input: Fact1: if an animal sweats then that animal 's bodily water decreases, Fact2: Most of the time, sweating can reduce body-heat., Question: Reducing body-heat can also decrease an animal's what? (A) Quality of life (B) prolactin release (C) Bodily water (D) Heart rate (E) heat energy (F) Weight (G) Temperature (H) energy
Example Output: C

Example Input: Fact1: energy is used for heating a building by a heating system, Fact2: Solar energy is the energy in the sun's rays., Question: What can be used for heating a building by a heating system? (A) the Sun's rays (B) peachleaf willow (C) engines (D) oxygen (E) photosynthesis (F) photons (G) air (H) hydrogen and oxygen
Example Output:
A