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 is caused by ill except: 
Select and explain. 
A. Sarcoidosis, B. Old age, C. Hypoparathyroidism, D. Steroid therapy
C: Hypoparathyroidism
Answer: C: Hypoparathyroidism 
Explanation: Answer is C (Hypoparathyroidism) : Osteoporosis is a feature of Hyperparathyroidism (not hypoparathyroidism).