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: Caffeine is a central nervous system stimulant., Fact2: Cocaine is a stimulant and increases the user's heart rate and blood pressure., Question: What does caffeine do? (A) Increase fame (B) increases a body's strength (C) Release energy (D) Increase user's heart rate (E) Transfers energy (F) decrease stamina (G) Increase intelligence (H) Increase wealth

Ex Output:
D


Ex Input:
Fact1: hydropower requires damming a river, Fact2: Another source of energy is hydropower., Question: What is a source of energy? (A) fossil fuels (B) cooking (C) damming a river (D) sleeping (E) napping (F) Electrical energy (G) our nearest star (H) sunlight

Ex Output:
C


Ex Input:
Fact1: the looseness of soil increases the amount of oxygen in that soil, Fact2: Soil oxygen effects on root development., Question: Why does it help for dirt to be loose? (A) Physical weathering (B) adding heat (C) It used to be covered by water (D) permineralization (E) water conservation (F) Roots get more oxygen (G) The area was once underwater (H) Riding a bike

Ex Output:

F