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': 'The commonest cause for mortality in Iver levis operations - \nSelect and explain. \nA. Pulmonary atelectasis, B. Anastomotic leak, C. Thoracic duct fistula, D. Subdiaphragmatic collection', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ivor Lewis operation - is subtotal esophagectomy done for Ca esophagus in the lower third of esophagus. Part of stomach and esophagus are resected and remnants of both anastomosed.\nAnastomotic leak is the most logical answer.\nI have also confirmed it from Senior residents of surgery.', 'role': 'assistant'}]