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 life relies on a relatively narrow range of pH, or acidity., Fact2: All organisms have life cycles., Question: what relies on a relatively narrow range of acidity? (A) organisms (B) carbon (C) animals (D) hydrogen (E) density (F) trees (G) Most plants (H) barnacles
Example Output: A

Example Input: Fact1: soil erosion means soil loss through wind, Fact2: Wind is defined as moving air., Question: what causes soil loss from soil erosion? (A) nutrients (B) flooding (C) rainfall (D) moving air (E) deforestation (F) forces (G) stagnant air (H) lome
Example Output: D

Example Input: Fact1: Viruses cannot reproduce by themselves., Fact2: Influenza Virus Influenza viruses make up the family Orthomyxoviridae., Question: What cannot reproduce by themselves? (A) fungi (B) insects (C) influenza (D) Leptospirosis (E) bacteria (F) ferns (G) mammals (H) acetic acid
Example Output:
C