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: Insects may live in large colonies and have complex social behaviors., Fact2: Ants are social insects living in colonies., Question: What type of behavior does an ant have? (A) Randomized (B) Social (C) Solitary (D) dangerous (E) complex (F) Problematic (G) movement (H) kinetic
[EX A]: B

[EX Q]: 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
[EX A]: D

[EX Q]: Fact1: adding salt to a solid decreases the freezing point of that solid, Fact2: Water density decreases with temperature and increases with salt content., Question: What content increases melting points of solids? (A) salt (B) Joules (C) water (D) fats (E) heat (F) glass (G) sugar (H) coal
[EX A]:
A