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
The following statements are ture regarding the SA node except - 
Select and explain. 
A. 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
A: Is located at the right border of the ascending aorta
Answer: A: Is located at the right border of the ascending aorta 
Explanation: 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.