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': 'Aerial supply to SA node is by: \nSelect and explain. \nA. Left anterior descending coronary aery, B. Posterior interventricular (descending) aery, C. Left coronary aery, D. Right coronary aery', 'role': 'user'}, {'content': 'Answer: D \nExplanation: The right coronary aery arises from the anterior aoic sinus of the ascending aoa and runs forward between the pulmonary trunk and the right auricle.The aery of the sinuatrial node (branch of right coronary aery) supplies the SA node and the right and left atria; in 40% of individuals it arises from the left coronary aery.', 'role': 'assistant'}]