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: Medicine
Obstruction in pulmonary stenosis may occur at the following sites : 
Select and explain. 
A. Supravalvular, B. Valvular, C. Subvalvular, D. All of the above
D: All of the above
Answer: D: All of the above 
Explanation: Answer is D (All of the above) Pulmonic stenosis may occur at valvular, supravalvular and subvalvular level. Anatomically, Pulmonary stenosis may be located at: Valvular level Subvalvular level : This is also called Infundibular pulmonary stenosis. Supravalvular level : This is also called Peripheral pulmonary stenosis..