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: Medicine
[{'content': 'A continuous murmur is heard in all of the following conditions except - \nSelect and explain. \nA. Ventricular septal defect with aortic regurgitation, B. Patent ductus arteriosus, C. Coronary arteriovenous fistula, D. Venous hum', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]