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").

Ex 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

Ex Output:
C


Ex Input:
Fact1: hydropower requires damming a river, Fact2: Another source of energy is hydropower., Question: What is a source of energy? (A) fossil fuels (B) cooking (C) damming a river (D) sleeping (E) napping (F) Electrical energy (G) our nearest star (H) sunlight

Ex Output:
C


Ex Input:
Fact1: dropping an object into water causes vibrations in the water, Fact2: Sound vibrations can be compared to pond ripples., Question: dropping an object into water causes what? (A) pond ripples (B) pond scum (C) chemical changes (D) heat energy (E) kinetic energy (F) activation energy (G) color changes (H) towels fluffed

Ex Output:

A