This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Oesophagus, Subject name: Surgery
Heller myotomy is done for: 
Select and explain. 
A. Pyloric stenosis, B. Hirschsprung, C. Achalasia, D. DES
C: Achalasia
Answer: C: Achalasia 
Explanation: Ans. (c) AchalasiaRef Bailey 26th edition 1010* Modified Heller cardiomyotomy: Achalasia cardia* Ramstaed's pyloromyotomy: Pyloric stenosis (Congenital)* Duhamel operation: Hirschsprung disease