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
AV node is situated in 
Select and explain. 
A. Opening of SVC, B. Interventricular septum, C. Koch's triangle, D. Interatrial septum
C: Koch's triangle
Answer: C: Koch's triangle 
Explanation: Koch's triangle is an anatomical area located within right atrium, defined by Ostium of coronary sinus, posteriorly The anterior-septal leaflet commissure Tendon of Todaro ( a tendinous structure connecting the valve of the inferior venacava ostium to the central fibrous body posteriorly) Used as anatomical landmark for location of AV node during electrophysiology procedures such as pacing or ablation. Ref - researchgate.net