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
[{'content': 'Motility in the upper third of the oesophagus is decreased in all except- \nSelect and explain. \nA. Psudobulbar palsy, B. Chagas disease, C. Myasthenia gravis, D. Scleroderma', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Ans is d i.e. Scleroderma', 'role': 'assistant'}]