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': 'Abbey-Estlander Flap is used in the reconstruction of \nSelect and explain. \nA. Buccal mucosa, B. Lip, C. Tongue, D. Palate', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e. Lip", 'role': 'assistant'}]