In coronary artery by-pass surgery the blood vessel to be used as graft has to be

Correct answer: (d) Any of these

Explanation

Coronary artery bypass grafting (CABG) reroutes blood around a blocked heart artery using a healthy vessel taken from elsewhere in the body.

Common grafts include the saphenous vein from the leg, the radial artery from the forearm, and the internal mammary artery from the chest.

Since any of these vessels can serve as the graft, no single option alone is correct.