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: 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: a graduated cylinder is used to measure volume of a liquid, Fact2: Volume is typically measured in liters or milliliters., Question: What could be used to to measure how many milliliters something is? (A) solid, liquid, gas (B) A graduated cylinder (C) objects that have mass (D) an electron microscope (E) The bending of a ray of light (F) deoxyribonucleic acid (G) a hydraulic system (H) microscope
Example Output: B

Example Input: Fact1: Biomass is the total mass of organisms at a trophic level., Fact2: Most living things are called organisms., Question: Biomass is the total mass of living things at each what? (A) trophic level (B) important habitats (C) Energy. (D) food and shelter (E) Power plants (F) animals (G) body water (H) heat energy
Example Output:

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
A

