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 artery except - \nSelect and explain. \nA. Right coronary artery lies in right anterior coronary sulcus, B. Left anterior descending artery is a branch of left coronary artery, C. Usually 3 obtuse marginal arteries arise from left coronary artery, D. In 85% cases posterior descending interventricular artery arises from right coronary artery', 'role': 'user'}, {'content': 'Answer: C \nExplanation: From the left coronary artery, only a single obtuse marginal artery arises.', 'role': 'assistant'}]