This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Anatomy
All veins opens into coronary sinus EXCEPT: 
Select and explain. 
A. Great cardiac vein, B. Anterior cardiac vein, C. Middle cardiac vein, D. Left posterior ventricular vein
B: Anterior cardiac vein
Answer: B: Anterior cardiac vein 
Explanation: Anterior cardiac vein "Anterior cardiac veins empty directly into the right atrium" VENOUS DRAINAGE OF HEA: The hea is drained mainly by veins that empty into the coronary sinus and paly by small veins that empty directly into the chambers of the hea. The coronary sinus the main vein of the hea, is a wide venous channel that runs from left to right in the posterior pa of the coronary groove.