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': "'Pencil tip' deformity is seen in : \nSelect and explain. \nA. Carcinoma esophagus, B. Achalasia Cardia, C. Barrett's oesophagus, D. None of the above", 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e. Achalasia Cardia", 'role': 'assistant'}]