Definition: 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: Cells vary in size as well as shape, but all cells are very small., Fact2: All cells are microscopic in size., Question: Cells pretty much al share this one characteristic: (A) sensory neurons (B) voltage (C) aerobic capacity (D) microscopic (E) eukaryotic (F) bacteria (G) prokaryotic (H) layers of fat
Output:
D