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': 'The following statements are ture regarding the SA node except - \nSelect and explain. \nA. Is located at the right border of the ascending aorta, B. In contains specialized nodal cardiac muscle, C. It is supplied by the atrial branche of the right coronary artery, D. It initiates cardiac conduction', 'role': 'user'}, {'content': 'Answer: A \nExplanation: SA node is supplied mostly by right coronary artery and beats at a rate of 70-80/min. It is situated at upper end of crista terminalis in the right atrium.', 'role': 'assistant'}]