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: if fossils of a water animal or plant are found in a place then that place used to be covered by water in the past, Fact2: Marine fossils found in the interior of the continent., Question: Why are marine fossils in the interior of a continent? (A) erosion from rivers (B) It used to be covered by water (C) They evolved to be land animal (D) basic building blocks of life (E) They washed ashore (F) the wearing away of rock (G) Land animals ate them (H) units of heredity
Example Output: B

Example Input: Fact1: a breathing mask is used for keeping harmful particles from entering the respiratory system, Fact2: Oxygen enters the respiratory system through the mouth and the nose., Question: Breathing masks are used to keep harmful particles from entering the mouth and the what? (A) body (B) eyes (C) air (D) skin (E) gullet (F) nose (G) ears (H) lungs
Example Output: F

Example Input: Fact1: All chemical reactions require activation energy to get started., Fact2: Fire is a chemical reaction., Question: What do fires require to get started? (A) vacuum (B) heating liquids (C) energy usage (D) water (E) activation energy (F) phosphorus (G) adding heat (H) direct energy
Example Output:
E