Which among the following is FALSE feature regarding Atrial Septal Defect (ASD) ?

Cardiac disease Murmur ASD Shunt murmur is absent but flow murmur is present leading to mid diastolic murmur. Pulmonary plethora will lead to pulmonary aery hypeension and development of loud P2. Presents late Mitral stenosis Leads to mid diastolic murmur. Later PAH develops and leads to loud P2. HOCM Result in ejection systolic murmur with narrow split/ paradoxical split S2 Hence it is unlikely as a diagnosis in this case Pulmonary aery Hypeension Leads to loud P2. Severe PAH, early Pulmonic regurgitation can occur. Called as Graham Steel murmur.