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: Cells are organized into tissues, and tissues form organs., Fact2: Bacteria are one-celled organisms., Question: what only have one cell and no tissue? (A) ferns (B) Most plants (C) mice (D) bacteria (E) frogs (F) Conifers (G) cell wall (H) fungi
Output:
D