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: Anatomy
Premature closure of foramen ovale results is : 
Select and explain. 
A. Underdeveloped right atrium, B. Right ventricular hyperophy, C. Left ventricular hyperophy, D. Pulmonary stenosis
B: Right ventricular hyperophy
Answer: B: Right ventricular hyperophy 
Explanation: B i.e., Right ventricular hyperophyBefore bih, foramen ovale allows most of the oxygenated blood entering the right atrium from inferior vena cava to pass into left atrium & prevents the opposite direction flow because the septum primum closes against relatively rigid septum secundum. After bih foramen ovale closes functionally and approximately at 3 months of age valve fuses with the septum secundum forming oval fassa. Premature closure leads to right ventricular hyperophyQ