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
[{'content': 'A 60-years old male has been operated for carcinoma of caecum and right hemicolectomy has been done. On the fouh post - oprative day, the patient develops fever and pain in the legs.The most impoant clinical entity one should look for is - \nSelect and explain. \nA. Urinary tract infection, B. Intravenous line infection, C. Chest infection, D. Deep vein thrombosis', 'role': 'user'}, {'content': "Answer: D \nExplanation: Ans. is `d' i.e., Deep vein thrombosis Old age and post operative period are risk factor for deep vein thrombosis", 'role': 'assistant'}]