This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: CVS Embryology, Subject name: Anatomy
[{'content': 'True about atrioventricular groove are all EXCEPT \nSelect and explain. \nA. Contains left anterior descending coronary aery, B. Also called coronary sulcus, C. Contains right coronary aery, D. Contains circumflex branch of left coronary aery', 'role': 'user'}, {'content': 'Answer: A \nExplanation: AV groove is aka coronary sulcus & it separates the atria from the ventricles. It contains the RCA on the right & the circumflex branch of left coronary aery on the left.', 'role': 'assistant'}]