This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Pericardium & Heart, Subject name: Anatomy
[{'content': 'Vein located in anterior interventricular sulcus - \nSelect and explain. \nA. Great cardiac vein, B. Coronary sinus, C. Middle cardiac vein, D. Small cardiac vein', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Great cardiac vein Coronary (Atrioventricular) sulcusGreat cardiac vein, coronary sinus, Small cardiac vein, RCA, LCX.Anterior interventricular sulcusGreat cardiac vein, left anterior descending (interventricular) artery.Posterior interventricular sulcusMiddle cardiac vein, Posterior interventricular branch of RCA.", 'role': 'assistant'}]