This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: C.V.S, Subject name: Pediatrics
[{'content': 'ASD with murmur similar to MR and left axis detion ? \nSelect and explain. \nA. ASD secondum, B. ASD primum, C. Floppy mitral valve, D. ASD secondum with rheumatic MR', 'role': 'user'}, {'content': 'Answer: B \nExplanation: ASD primum lead to left axis detion. Ghai essential of pediatrics, eighth edition, p.no:413', 'role': 'assistant'}]