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: Butter is a fat that is a solid at room temperature., Fact2: Some fats are more likely to cause heart disease., Question: What can butter lead to? (A) Heart disease (B) air pollution (C) reproduction (D) destruction (E) religion (F) trees (G) heating (H) Tooth pain
[EX A]: A

[EX Q]: 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 A]: C

[EX Q]: Fact1: threatening behavior by predators causes a porcupine to extend its quills, Fact2: Aggression is active, harmful and offensive, threatens all and benefits none., Question: What by predators cause porcupines to extend their quills? (A) hypothyroidism (B) killing insects (C) kisses (D) aggression (E) love (F) hyperthyroidism (G) kinetic energy (H) cohabitating
[EX A]:
D