This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Radiological anatomy, Subject name: Radiology
The ring is denoting the location of ? 
Select and explain. 
A. Aoic valve, B. Pulmonary valve, C. Tricuspid valve, D. Mitral valve
C: Tricuspid valve
Answer: C: Tricuspid valve 
Explanation: CT scan image shows the area located between Rt Atrium and Rt Ventricle denoting the area of tricuspid valve.