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: ENT
[{'content': 'Lynch howarth procedure is not used for \nSelect and explain. \nA. To drain frontal mucocele, B. To remove frontal osteoma, C. To repair CSF leak, D. To treat epistaxis', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]