This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: C.V.S, Subject name: Medicine
A female patient has dysphagia, intermittent epigastric pain. On endoscopy, the oesophagus was dilated above and narrow at the bottom. Treatment is 
Select and explain. 
A. PPI, B. Dilatation, C. Esophagectomy, D. Heller's cardiomyotomy
D: Heller's cardiomyotomy
Answer: D: Heller's cardiomyotomy 
Explanation: Achalasia typically presents with dysphagia, although pain (often mistaken for reflux) is common in the early stages.Dilated oesophagus with acute narrowing in LES region is noted.Treatment is by either endoscopic dilatation or surgical myotomyBailey and Love 26th edition pg: 1015