This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Bleeding from the GUT and diseases of esophagus, Subject name: Medicine
Most common complication of achalasia is: 
Select and explain. 
A. Recurrent pulmonary infections, B. Stricture of esophagus, C. Pleurisy, D. Peptic ulcer
A: Recurrent pulmonary infections
Answer: A: Recurrent pulmonary infections 
Explanation: Achalasia Rare motility disorder of the esophagus which results from lack of innervation of the lower esophageal sphincter muscles and leads to dilatation of proximal esophagus. Typically with dysphagia, vomiting of undigested food and failure to thrive. Cough can be present in achalasia patients due to aspiration of food or due to airway compression by the dilated esophagus resulting in recurrent pulmonary infections.