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").

Example 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
Example Output: B

Example Input: Fact1: Plants use cellulose for their cell walls., Fact2: Green bean plantings continue to be planted., Question: What do green beans use for their cell wall? (A) Energy (B) cellulite (C) cellular (D) cellolosis (E) cellulose (F) lmestone (G) layers of fat (H) heat energy
Example Output: E

Example Input: Fact1: conserving water can be used for survival in a dry environment, Fact2: Conservation of water follows conservation of sodium., Question: Conserving what can be used for survival in a dry environment? (A) bamboo (B) Collagen (C) root (D) sodium (E) cellulose (F) energy (G) salinity (H) Conifers
Example Output:
D