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 Input:
Fact1: All chemical reactions require activation energy to get started., Fact2: Fire is a chemical reaction., Question: What does fire require to get started? (A) an engine (B) activation energy (C) water (D) energy usage (E) direct energy (F) dogs (G) activated almonds (H) adding heat

Ex Output:
B

Ex Input:
Fact1: Hormones are chemical messengers that control many body functions., Fact2: Growth hormone is in many ways an anti-aging hormone., Question: What controls anti-aging? (A) A computer (B) air (C) chemical messengers (D) ice (E) an electric stove (F) Electrical energy (G) water (H) Chemical energy

Ex Output:
C

Ex Input:
Fact1: darkness has a negative impact on photosynthesis, Fact2: All plants live and grow by photosynthesis., Question: What has a negative impact on plant growth? (A) disease (B) Pollution (C) nutrients (D) care (E) competition (F) darkness (G) light (H) Pesticides

Ex Output:
F