You will be given a definition of a task first, then some input of the task.
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").

Fact1: Carbon cycles quickly between organisms and the atmosphere., Fact2: Carbon dioxide is controlled by the carbon cycle., Question: what is controlled between organisms and the atmosphere? (A) carbon dioxide (B) sweating (C) temperature (D) air pressure (E) heat energy (F) Pollution (G) energy usage (H) Chemical energy
Output:
A