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': 'Prognosis in a case of duodenal perforation is determined by all except \nSelect and explain. \nA. Age of the patient, B. Duration of history, C. Basal pneumonia, D. Peritonitis', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]