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 Q]: Fact1: Mutualism is a symbiotic relationship in which both species benefit., Fact2: Dogs and humans are symbiotic species., Question: what exists between dogs and humans? (A) mutualism (B) gravity (C) communication (D) antigens (E) several genes (F) space between (G) electrons (H) german shepherd
[EX A]: A

[EX Q]: Fact1: Insects may live in large colonies and have complex social behaviors., Fact2: Like other ants, the fire ant is a social insect., Question: What may live in large colonies? (A) animals (B) tigers (C) tardigrades (D) fire ants (E) bears (F) honeybees (G) orchids (H) graptolites
[EX A]: D

[EX Q]: Fact1: disease has a negative impact on an organism, Fact2: Influenza, or the flu, is a contagious disease caused by a virus., Question: What has a negative impact on an organism? (A) leukemia (B) vitamins (C) minerals (D) the flu (E) smallpox (F) cancer (G) water (H) viruses
[EX A]:
D