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': '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 schwartze sign', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]