Given the task definition and input, reply with output. 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: microscope is used to see small things by biologists by making them appear bigger, Fact2: Biologists study living creatures., Question: What makes living creatures appear bigger? (A) fur and fat (B) xrays (C) squids (D) microscopes (E) deuterostomes (F) hearing (G) screen (H) mutations
D