A young female presents with history of dyspnoea on exertion. On examination, she has wide, fixed split S2 with ejection systolic murmur (III/VI) in left second intercostal space. Her EKG shows left axis deviation. The most probable diagnosis is: (A) Total anomalous pulmonary venous drainge, (B) Tricuspid atresia, (C) Ostium primum atrial septal defect., (D) Ventricular septal defect with pulmonary arterial hypertension
Answer is C. None