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: Medicine
The right coronary aery supplies all of the following pas of the conducting system in the hea except: 
Select and explain. 
A. SA Node, B. AV Node, C. AV Bundle, D. Right Bundle branch
D: Right Bundle branch
Answer: D: Right Bundle branch 
Explanation: Answer is D (Right bundle branch) Right bundle is supplied by the Left coronary aery. Right coronary aery supplies the SA node (in 65% cases), AV node, AV bundle or Bundle of His and pa of left bundle branch(LBB) Left cronoary aery supplies the right bundle branch (RBB, pa of LBB and sometimes the SA node (in 35% cases),