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: 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

Ex Output:
A


Ex Input:
Fact1: electricity is used as an energy source by electrical devices, Fact2: Electrical fields result from electrical devices and televisions., Question: What is used as an energy source by television? (A) electricity (B) light (C) our nearest star (D) air (E) energy (F) satellites (G) photons (H) rocks

Ex Output:
A


Ex Input:
Fact1: landfills have a negative impact on the environment, Fact2: Landfills are a designated place where garbage is buried underground., Question: what has a negative impact on the environment? (A) summer (B) massive damage (C) harmful substances (D) gravity (E) deforestation (F) underground garbage (G) h2o (H) enormous damage to homes

Ex Output:

F