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").

Input: Consider Input: Fact1: tidal energy can be used to produce electricity, Fact2: Tidal caves are formed by the energy of the rising and falling tides., Question: what can produce electricity? (A) rivers (B) animal transport (C) tidal caves (D) Nematoda (E) rays or beams (F) animals (G) cactuses (H) photons

Output: C


Input: Consider Input: Fact1: Evolution is a change in the characteristics of living things over time., Fact2: Trees are the largest of living things., Question: Evolution changes the characteristics of what over time? (A) the Moon (B) Man (C) life (D) trees (E) rocks (F) the Sun (G) humans (H) plants

Output: D


Input: Consider Input: Fact1: Caffeine is a central nervous system stimulant., Fact2: Coffee is an excellent source of caffeine., Question: What stimulates the central nervous system? (A) exercise (B) blood (C) rice (D) coffee (E) A drug. (F) a chime (G) ice (H) sweating


Output: D