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': 'Gibson’s murmur is a feature of \nSelect and explain. \nA. Patent Ductus arteriosus, B. Mitral Valve prolapse, C. Pulmonary regurgitation, D. Mitral regurgitation', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Continuous machinery murmur of PDA is also called Gibson’s murmur.', 'role': 'assistant'}]