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: Many corals secrete an exoskeleton that builds up to become a coral reef., Fact2: Good examples are Bubble coral, Elegance coral, Frogspawn and other Euphyllia corals., Question: What is secreted by organisms like frogspawn to become a reef? (A) exocrine glands (B) food and shelter (C) exoskeleton (D) bones (E) Energy (F) Chemical energy (G) plasma (H) Energy.

Ex Output:
C


Ex Input:
Fact1: Earth 's tilt on its rotating axis causes seasons to change, Fact2: Weather changes from season to season., Question:  Earth 's tilt on its rotating axis causes changes in what (A) weather (B) sunlight (C) Joules (D) wind (E) heat (F) climate (G) energy (H) earth

Ex Output:
A


Ex Input:
Fact1: an electrical insulator slows the transfer of electricity, Fact2: Sulfur is a good electrical insulator., Question: What is something that can be used to impede electrical transference? (A) A virus (B) hormones (C) sulfur (D) forces (E) tar (F) toxins (G) mutations (H) storms

Ex Output:

C