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").

Input: Consider Input: Fact1: wiring requires an electrical conductor, Fact2: Wires connected to a source of electricity., Question: An electrical conductor is required for the operation of: (A) water current (B) electricity (C) satellites (D) energy (E) to move people (F) gas lamps (G) trains (H) lightning

Output: B


Input: Consider Input: Fact1: Evolution occurs in response to a change in the environment., Fact2: Extinction is a natural part or the process of evolution., Question: What happens to an environment to cause extinction?  (A) relocation (B) changes (C) rain (D) exposure (E) forces (F) wind (G) Pollution (H) discovery

Output: B


Input: Consider Input: Fact1: using renewable resources to generate power reduces greenhouse gases, Fact2: Chlorofluorocarbons are greenhouse gases., Question: Using renewable resources reduces what? (A) Heat energy (B) energy usage (C) massive damage (D) chlorofluorocarbons (E) direct damage to the lungs (F) Temperature (G) deforestation (H) scarce resources


Output: D