This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Surgery
Thromboembolism after pelvic surgery is usually from the veins - 
Select and explain. 
A. iliac, B. Calf, C. Femoral, D. Pelvic
C: Femoral
Answer: C: Femoral 
Explanation: • MC site of DVT: Calf veins (soleal veins)
• MC site thrombosis for pulmonary thromboembolism: Femoropopliteal veins
• Calf veins are the most common site of DVT in post-operative period, but risk of embolism from calf venous thrombosis is extremely low.
• DVT of femoropopliteal veins are the most common site of pulmonary thromboembolism.