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': 'Commonest cause of hea failure in infancy is ________ \nSelect and explain. \nA. Myocarditis, B. Rheumatic fever, C. Cardiomyopathy, D. Congenital hea disease', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Most common cause of congestive cardiac failure in infants is congenital hea disease. Ref : Ghai essential of pediatrics, eighth edition ,p.no:397', 'role': 'assistant'}]