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: Trees have woody stems covered with bark., Fact2: During the stripping, the protective layer of inner bark is removed., Question: Trees have woody stems covered with what? (A) food and shelter (B) smooth ridges (C) looseness (D) protective layer (E) Organic compounds (F) plastic sheet (G) heat energy (H) thin metal
Output:
D