Q: 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: infection can cause bodily tissues to swell, Fact2: An aneurysm is a swelling in a blood vessel., Question: What can cause an aneurysm? (A) smoking (B) infection (C) bacteria (D) viruses (E) Pollution (F) steroids (G) influenza (H) rays or beams
A:
B