Instructions: 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").
Input: Fact1: Gene flow occurs when individuals move into or out of a population., Fact2: Gene flow tends to decrease differentiation., Question: What tends to occur when individuals move into or out of a population? (A) competing for resources (B) extinction (C) matter is destroyed (D) metabolic reaction (E) rapid exponential growth (F) seed dispersal (G) decreased differentiation (H) permineralization
Output:
G