Answer and Explanation 21

21.  B is the correct answer.  Elevated cortisol levels is not a risk factor for thromboembolism.  Malignancy is a hypercoagulable state.  Recent sugery in particular when general anesthesia is administered is a risk factor.  It has been shown to slow the  flow of venous blood through the femoral veins.  Smoking on oral contraception is also a risk factor.