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: Urine is the liquid waste product of the body that is excreted by the urinary system., Fact2: Mammals excrete urea in the watery form of urine ., Question: What is a waste product of the body that is excreted by the urinary system? (A) potash (B) food (C) CO 2 (D) sugar (E) urea (F) liquid (G) H 2 O (H) sulfur
Example Output: E

Example Input: Fact1: the emission of sulfur dioxide causes acid rain, Fact2: The sulfur dioxide is converted into sulfuric acid., Question: what causes acid rain? (A) gases (B) rainfall (C) Pollution (D) fossil fuels (E) emissions (F) vehicles (G) burning (H) wind
Example Output: E

Example Input: Fact1: a stem is used to store water by some plants, Fact2: Some plants also store water in their trunks and stems., Question: Where do plants store water? (A) watershed (B) Collagen (C) excretory (D) trunks (E) fibrils (F) soil (G) Winter (H) cellulose
Example Output:
D