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': 'RBBB with left Axis eviation is characteristic of \nSelect and explain. \nA. Ostium Primum ASD, B. Mitral valve prolapse, C. Patent Ductus Arteriosus, D. Ventricular Septal Defect', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]