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: Surgery
Motility in the upper third of the oesophagus is decreased in all except- 
Select and explain. 
A. Psudobulbar palsy, B. Chagas disease, C. Myasthenia gravis, D. Scleroderma
D: Scleroderma
Answer: D: Scleroderma 
Explanation: Ans is d i.e. Scleroderma