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: Bottleneck effect occurs when a population suddenly gets much smaller., Fact2: Animals and plants exist as populations., Question: When an animal or plant group gets much smaller, that's called a: (A) bottleneck (B) Winter (C) Movement (D) population explosion (E) genus (F) relocation (G) Mason jar effect (H) choker
Output:
A