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: Evolution occurs by a process called natural selection., Fact2: Adaptation is the result of natural selection., Question: What leads to evolution? (A) Plants growth (B) competition (C) Adatation (D) our star (E) Experimentation (F) Stagnation (G) environment (H) Information
Example Output: C

Example Input: Fact1: Cells are the basic units of the structure and function of living things., Fact2: Tigers are the largest of the living cats., Question: Cells are the basic units of the structure and function of what? (A) water (B) mammals (C) ice (D) tigers (E) animals (F) humans (G) plants (H) the Sun
Example Output: D

Example Input: Fact1: most canyons are formed by flowing rivers through erosion over long periods of time, Fact2: Canyon Lake Canyon lake was formed by dams on the Salt River., Question: what can form canyons? (A) spring (B) storms (C) dams (D) mines (E) salmon (F) two (G) rain (H) cut
Example Output:
C