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: Medicine
Osteoporosis may be seen in all except: 
Select and explain. 
A. Hyperparathyroidism, B. Hypoparathyroidism, C. Thyrotoxicosis, D. Heparin administration
B: Hypoparathyroidism
Answer: B: Hypoparathyroidism 
Explanation: Answer is B (Hypoparathyroidism) Osteoporosis is caused by hyperparathyoroidism and not by hypoparathyroidism