The atrial septal defect (ASD) most commonly associated with partial anomalous pulmonary venous return (PAPVR) is:

A. Secundum defect.
B. Sinus venosus defect.
C. Ostium primum defect.
D. Complete atrioventricular (AV) canal defect.
E. Coronary sinus defect.

Ans: B