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: Some parasites kill their host, but most do not., Fact2: Tapeworms are internal parasites of vertebrates., Question: What are hosted, but don't usually kill their host? (A) ferns (B) deadly viruses (C) insects (D) tapeworms (E) bacteria (F) orchids (G) deadly diseases (H) white blood cells
Output:
D