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
The diameter of Tricuspid orifice is 
Select and explain. 
A. 2cm, B. 2.5cm, C. 3cm, D. 4cm
D: 4cm
Answer: D: 4cm 
Explanation: ValveDiameter of OrificePulmonary2.5cmAoic2.5cmMitral3cmTricuspid4cmRef: BD Chaurasia; Volume 1; 6th edition; Table 18.1