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: wind and rain cause erosion, Fact2: Water, in the form of rain, is the most effective agent of erosion., Question: What causes erosion the most? (A) streams (B) motion (C) LEDs (D) water (E) Roads (F) rivers (G) Winter (H) wind

Ex Output:
D


Ex Input:
Fact1: Oxygen is essential for cellular respiration for all aerobic organisms., Fact2: Arteries carry oxygen to tissues and organs., Question: What are essential for cellular respiration? (A) leaves (B) Energy (C) arteries (D) Energy. (E) branches (F) glucose (G) acetic acid (H) skull

Ex Output:

C