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: Pediatrics
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: Ans. is 'd' i.e., All of the above o Anatomically, Pulmonary stenosis may be located at : 1. Valvular level 2. Subvalvular level : also called infundibular pulmonic stenosis. 3. Supra valvular level : this is uncommon and refers to stenosis above the valve.