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: Kidney failure may be treated with dialysis., Fact2: Dialysis is a procedure to filter the blood., Question: What may be treated with a procedure to filter the blood? (A) saves lives (B) Car accidents (C) kidney failure (D) headaches (E) melanin content (F) herpes (G) unicellular organisms (H) gastroenteritis
C