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, answer the question "What can cause an aneurysm?" with the following options: 
- smoking
 - infection
 - bacteria
 - viruses
 - Pollution
 - steroids
 - influenza
 - rays or beams


 

  infection       