Detailed 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").
Q: Fact1: microscope is used to see small things by biologists by making them appear bigger, Fact2: Bioaerosols are extremely small living organisms or fragments of living things suspended in the air., Question: what do biologists use a microscope to see by making them appear bigger? (A) sea urchins (B) squids (C) Jellyfish (D) bioaerosols (E) tunicates (F) most cephalopods (G) mussels (H) tiny polyps
A:
D