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: Steroid hormones are made of lipids, such as phospholipids and cholesterol., Fact2: Fats are known as lipids., Question: What are steroid hormones made of? (A) bacteria (B) fats (C) sugar (D) muscle (E) H 2 O (F) sunlight (G) the Sun (H) SO2

Ex Output:
B


Ex Input:
Fact1: All chemical reactions require activation energy to get started., Fact2: Chemical changes are a result of chemical reactions., Question: What is required before a chemical change? (A) kinetic energy (B) energy usage (C) activation push (D) activation energy (E) activation switch (F) activation power (G) Burning fuel and air (H) Evaporation

Ex Output:
D


Ex Input:
Fact1: condensation is when change from a gas into a liquid by reducing heat energy, Fact2: Clouds form by the condensation of water vapor., Question: Water vapor is formed when gas changes into a liquid by reducing what? (A) direct energy (B) electrical energy (C) kinetic energy (D) heat energy (E) solar flares (F) Temperature (G) energy (H) water power

Ex Output:

D