This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Otosclerosis, Subject name: ENT
[{'content': 'All of the following statements about sodium fluoride in otosclerosis are true, except: \nSelect and explain. \nA. Acts by inhibiting Proteolytic enzymes in cochlea, B. Acts by inhibiting osteoblastic activity, C. Is contraindicated in chronic nephritis, D. Is indicated in patients with a positive Schwaze sign', 'role': 'user'}, {'content': 'Answer: B \nExplanation: In active cases i.e. when Schwaze sign is present, medical management with sodium fluoride (Na F) is done. Na F accelerates the maturation of the focus by increasing osteoblastic and decreasing osteoclastic activity. It also inhibits the proteolytic enzymes that release cytotoxic chemicals to cochlea.', 'role': 'assistant'}]