Step down of PA saturation in PDA – Cardiology MCQ

Step down of pulmonary artery saturation in PDA (patent ductus arteriosus) is seen in:
a) Eisenmenger PDA
b) TOF (tetralogy of Fallot) with PDA
c) TGA (transposition of great arteries) with PDA
d) TAPVC (total anomalous pulmonary venous connection) with PDA
e) AP (aortopulmonary) window
Please see the YouTube video above for discussion