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
Balloon valvotomv is successful in all of the following cases except- 
Select and explain. 
A. Congenital pulmonary stenosis, B. Calcified mitral stenosis, C. Mitral stenosis is pregnancy, D. Congenital aoic stenosis
B: Calcified mitral stenosis
Answer: B: Calcified mitral stenosis 
Explanation: Ans. is 'b' i.e., Calcified mitral stenosis It is indicated in MS without calcification.