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: Urine is the liquid waste product of the body that is excreted by the urinary system., Fact2: Liquid waste is put into the bladder., Question: Urine is a product of what organ of the body that is excreted by the urinary system? (A) bowel (B) epidermal (C) bladder (D) alveoli (E) lungs (F) urine (G) mammals (H) NaCl
Output:
C