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: Pediatrics
[{'content': 'Commonest cause of heart failure in infancy is – \nSelect and explain. \nA. Myocarditis, B. Rheumatic fever, C. Cardiomyopathy, D. Congenital heart disease', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Congestive heart failure \n\nCongestive heart failure is state in which the heart cannot produce the cardiac out required to sustain the metabolic needs of the body, without evoking certain compensatory mechanism.\nThe most common cause of CHF in infants —> Congenital heart disease.\nThe most common cause of CHF in the older children —> Rheumatic fever & rheumatic heart disease.', 'role': 'assistant'}]