This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Thorax, Subject name: Anatomy
Which vein is found at the apex of the heart? 
Select and explain. 
A. Great cardiac vein, B. Coronary Sinus, C. Anterior cardiac vein, D. Middle cardiac vein
A: Great cardiac vein
Answer: A: Great cardiac vein 
Explanation: Ans. is 'a' i.e., Great cardiac vein Great Cardiac Vein* The great cardiac vein (left coronary vein) begins at the apex of the heart and ascends along the anterior longitudinal sulcus to the base of the ventricles.* It then curves to the left in the coronary sulcus, and reaching the back of the heart, opens into the left extremity of the coronary sinus, draining from the myocardium.