Q: Fact 1: Infection can cause bodily tissues to swell. Fact 2: An aneurysm is a swelling in a blood vessel. Given the two facts above, what can cause an aneurysm?

pick from the following.
1). smoking;
2). infection;
3). bacteria;
4). viruses;
5). Pollution;
6). steroids;
7). influenza;
8). rays or beams;
The answer is:
2).