<prompt> Motility in the upper third of the esophagus is decreased in all except:Pseudo-bulbar palsyChagas diseaseMyasthenia gravisScleroderma  <response>: Classification of Esophageal Motility Disorders Disorders of the Pharyngo-esophageal junction Neurological: Stroke, motor neurone disease, multiple sclerosis, Parkinson;s disease Myogenic: Myasthenia, muscular dystrophy Pharyngo-esophageal Zenker;s diveiculum Disorders of the body of the esophagus Diffuse esophageal spasm Nutcracker esophagus Autoimmune disorders- Systemic Sclerosis CREST Reflux associated idiopathic Allergic Eosinophilic esophagitis Non-specific esophageal dysmotility Disorders of the lower esophageal sphincter Achalasia Incompetent lower sphincter i.e., GERD Ref: Bailey and Love 27th edition Pgno: 1096 