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").
Q: Fact1: having no natural predators increases population size, Fact2: Koalas have no natural predators., Question: What has an increased population size over time? (A) trout (B) dolphins (C) squids (D) Frogs (E) dodos (F) koalas (G) white lions (H) Tasmanian tigers
A:
F