Answer 12

12.  C is the correct answer.  Cocaine, oral contraception have been identified as a risk factor as long as sympathomimetics.  Atrial fibrillation that is not anti-coagulated is a risk factor.  Marijuana use is not been identified as a risk factor.  Other common risk factors are diabetes, hypertension, smoking, family history of premature vascular disease, hyperlipidemia, prior history of TIA, recent myocardial infarction, and CHF with a low ejection fraction.