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
Koch's triangle has blood supply from - 
Select and explain. 
A. Right coronary artery, B. Left circumflex artery, C. Left anterior descending artery, D. Anterior aortic sinus
A: Right coronary artery
Answer: A: Right coronary artery 
Explanation: Koch’s triangle is a part of right atrium. Hence it is supplied by Right coronary artery.