Most common ASD is ?
Ostium primum
Patent foramen ovale
Ostium secondum
Sinus venosus
Ans. is 'c' i.e., Osteum secondum ASD can occur in any poion of atrial septum - Secundum Primum Sinus venosus Absent atrial septum (leads to single atrium) Ostium secondum defect Defect in region of fossa ovalis Most common form of ASD