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
Which of the following condition is not associated with osteoporosis? 
Select and explain. 
A. Immobilization, B. Thyrotoxicosis, C. Turner's syndrome, D. Hypoparathyroidism
D: Hypoparathyroidism
Answer: D: Hypoparathyroidism 
Explanation: Osteoporosis is associated with hyperparathyroidism. In hyperparathyroidism, excess parathyroid hormone in the blood stimulates extraction of calcium from bone to blood stream resulting in osteoporosis.