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: a plant requires sunlight to grow, Fact2: Sunlight is turned into energy by plants., Question: Sunlight is made of  (A) Prism (B) lightning (C) colors (D) glass (E) chlorophyll (F) dirt (G) energy (H) photons
Example Output: G

Example Input: Fact1: Behaviors that improve fitness increase through natural selection., Fact2: Fitness traits relate to an animal s ability to survive and reproduce., Question: behaviors increase through what that improve traits of animal's ability to survive (A) competition (B) hunting (C) biological diversity (D) the environment (E) eating (F) produce offspring (G) natural selection (H) grooming
Example Output: G

Example Input: Fact1: radioactive dating is used to determine the age of fossils, Fact2: Radioactive isotopes are commonly used for dating ., Question: what is used to determine the age of fossils? (A) Conifers (B) Sediment (C) calcite (D) skull (E) loose soil (F) cracking (G) exoskeleton (H) isotopes
Example Output:
H