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
Commonest cause of hea failure in infancy is ________ 
Select and explain. 
A. Myocarditis, B. Rheumatic fever, C. Cardiomyopathy, D. Congenital hea disease
D: Congenital hea disease
Answer: D: Congenital hea disease 
Explanation: Most common cause of congestive cardiac failure in infants is congenital hea disease. Ref : Ghai essential of pediatrics, eighth edition ,p.no:397