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
[{'content': 'Which of the following structures is located in the posterior interventricular sulcus? \nSelect and explain. \nA. Oblique vein of the left atrium, B. Great cardiac vein, C. Coronary sinus, D. Middle cardiac vein', 'role': 'user'}, {'content': 'Answer: D \nExplanation: The middle cardiac vein runs in the posterior interventricular sulcus, and the small cardiac vein runs in the coronary sulcus along the right coronary aery. The great cardiac vein lies in the anterior interventricular sulcus. The coronary sinus continues to the right in the coronary sulcus. The oblique vein is usually very small and empties into the coronary sinus.', 'role': 'assistant'}]