This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Thorax, Subject name: Anatomy
Koch's triangle has blood supply from 
Select and explain. 
A. Right coronary, B. Left circumflex, C. Left anterior descending, D. Anterior aoic sinus
A: Right coronary
Answer: A: Right coronary 
Explanation: Koch&;s triangle has blood supply from Right coronary