Coronary bypass grafts – Cardiology MCQ

All of the following are true about coronary bypass grafts except:
a) 8-12% of venous grafts are occluded at hospital discharge
b) Upto 30% of venous grafts may be occluded at 1 year
c) Saphenous vein grafts have a better patency than radial grafts
d) 85% of left LIMA grafts are patent at 10 years
Please see the YouTube video above for discussion