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': 'All of the following are true about coronary aery except: \nSelect and explain. \nA. Right coronary aery lies in right anterior coronary sulcus, B. Left anterior descending aey is a branch of left coronary aery, C. Usually 3 obtuse marginal aeries arise from left coronary aery, D. In 85% cases posterior descending interventri-cular aery arises from right co. a.', 'role': 'user'}, {'content': 'Answer: C \nExplanation: C i.e. Usually 3 obtuse marginal aeries arise form left coronary aery', 'role': 'assistant'}]