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
All are true about achalasia except 
Select and explain. 
A. Dilatation of proximal segment, B. It predisposes to malignancy, C. Body peristalsis is normal, D. LES pressure is increased
C: Body peristalsis is normal
Answer: C: Body peristalsis is normal 
Explanation: Destruction of the nerves to LES is primary pathology and degeneration of neuromuscular function of the body of the esophagus is secondary. An absence of body peristalsis and poor LES relaxation is mandatory for diagnosisRef: Harrison; 19th edition