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: pollutants have a negative impact on the environment, Fact2: Carbon dioxide is a pollutant., Question: What affects the environment negatively? (A) sunlight (B) normal weather patterns (C) carbon dioxide (D) cigarettes (E) positivity (F) Smoking (G) harmful substances (H) fossil fuels

Ex Output:
C


Ex Input:
Fact1: a compass is used to navigate oceans, Fact2: And to the east is the Atlantic Ocean., Question: what is a compass used to navigate? (A) density (B) lamphreys (C) marine (D) outer space (E) their speed (F) Antarctica (G) non-magnetic planets (H) the Atlantic

Ex Output:
H


Ex Input:
Fact1: All chemical reactions require activation energy to get started., Fact2: Catalysts lower the activation energy., Question: In what way does a catalyst help in chemical reactions? (A) Generating heat (B) lowered energy cost (C) metabolic reaction (D) heating liquids (E) by making heat (F) adding heat (G) increases a body's strength (H) preventing heat transfer

Ex Output:

B