This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: JIPMER 2017, Subject name: Surgery
[{'content': 'A patient undergoes surgery in pelvic region. Which vein is most likely to result in thrombosis? \nSelect and explain. \nA. Iliac vein, B. Femoral vein, C. Calf vein, D. IVC', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Risk factors for DVT Acquired: Obesity Infection Prolonged immobilization in surgery of lower limb or pelvic region M/C site of DVT - Calf vein or soleal vein M/C site of DVT leading to PE - Thigh vein or Femoropopliteal vein', 'role': 'assistant'}]