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': 'Ca oesophagus is characterized by following except? \nSelect and explain. \nA. Adenocarcinoma, B. Middle 1/3 affected, C. Dysphagia is characteristic, D. Pernicious anemia often present', 'role': 'user'}, {'content': "Answer: D \nExplanation: Answer is 'd' i.e. Pernicious anemia often present", 'role': 'assistant'}]