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': 'True statement about Rt coronary artery (RCA) -a) Diameter less than LCAb) RCA arises from anterior aortic sinusc) RCA supplies major part of right atrium and right ventricled) RCA gives rise to circumflex coronary branch \nSelect and explain. \nA. abc, B. bcd, C. ab, D. ac', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Circumflex artery is a branch of LCA. Rest all options are true.', 'role': 'assistant'}]