You will be given a definition of a task first, then some input of the task.
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").

Fact1: Male dogs use pheromones in urine to mark their territory., Fact2: Pheromones are chemicals produced by insects to communicate., Question: What uses chemicals in urine to mark their territory? (A) rabbit (B) bears (C) viruses (D) male dogs (E) alpacas (F) athletes (G) humans (H) bacteria
Output:
D