A 21-year old male presents with exeional dyspnea, raised JVP and loud P2. ECG shows right axis detion. All of the following conditions are possible except'

An ostium primum atrial septal defect (ASD) occurs when then atrial septum near the atrioventricular valves has a communication between the two atrium causing a left to right shunt. This rarely develops into Eisenmenger's syndrome if pulmonary hypeension develops reversing the direction of the shunt to right to left. Ref Davidson 23rd edition pg 453