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
Commonest cause of heart failure in infancy is – 
Select and explain. 
A. Myocarditis, B. Rheumatic fever, C. Cardiomyopathy, D. Congenital heart disease
D: Congenital heart disease
Answer: D: Congenital heart disease 
Explanation: Congestive heart failure 

Congestive 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.
The most common cause of CHF in infants —> Congenital heart disease.
The most common cause of CHF in the older children —> Rheumatic fever & rheumatic heart disease.