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 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
Example Output: D

Example Input: Fact1: Female monotremes lack a uterus and vagina., Fact2: Monotremes are mammals that lay eggs., Question: What do some female mammals lack? (A) epidermal (B) vision (C) uterus (D) alleles (E) fur (F) a cuticle (G) eardrum (H) alveoli
Example Output: C

Example Input: Fact1: a switch is used to start the flow of current in an electrical circuit, Fact2: Electrical power including lights etc can then be switched on., Question: what are on when there is flow of current in an electrical circuit (A) energy (B) lights (C) engine (D) cycles (E) brakes (F) waves (G) water (H) Vibrates
Example Output:
B