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': 'Osteoporosis is caused by all except ? \nSelect and explain. \nA. Fluorosis, B. Hypogonadism, C. Hypehyroidism, D. Hyperparathyroidism', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Fluorisis", 'role': 'assistant'}]