This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Other Vascular Disorders, Subject name: Surgery
[{'content': 'Treatment for DVT - \nSelect and explain. \nA. Unfractionated heparin, B. Limb elevation, C. Surgery, D. Duplex ultrasound', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e.. Unfractionated heparin", 'role': 'assistant'}]