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").
Q: Fact1: Kidney failure may be treated with dialysis., Fact2: Dialysis is the mechanical process of cleaning the blood., Question: Kidney failure may be treated by the mechanical process of cleaning the what? (A) lymph (B) blood (C) cells (D) fluid (E) surface (F) damage (G) bone (H) liquids
A:
B