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: Severe droughts have caused much of the rural population to urbanize., Question: Severe droughts may cause (A) evolution (B) population growth (C) forest is destroyed (D) species variation (E) major threat to health (F) Dehydration (G) the ground shaking (H) a bottleneck effect
Output:
H