This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Medicine
A patient complaining of difficulty of swallowing of solid
foods is suffering from all of the following except: 
Select and explain. 
A. diffuse esophagus spasm, B. Achalasia cardia, C. esophageal carcinoma, D. bulbar palsy
D: bulbar palsy
Answer: D: bulbar palsy 
Explanation: None