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
[{'content': 'Obstruction in pulmonary stenosis may occur at the following sites : \nSelect and explain. \nA. Supravalvular, B. Valvular, C. Subvalvular, D. All of the above', 'role': 'user'}, {'content': 'Answer: D \nExplanation: 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..', 'role': 'assistant'}]