This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Disorders of Parathyroid Gland, Subject name: Medicine
Osteoporosis is caused by all, except? 
Select and explain. 
A. Sarcoidosis, B. Old age, C. Hypoparathyroidism, D. Steroid therapy
C: Hypoparathyroidism
Answer: C: Hypoparathyroidism 
Explanation: In sarcoidosis the osteoporosis process is usually due to use of steroids. This means choice a and d is correct. Osteoporosis occurs more frequently with increasing age as bone tissue is lost progressively. In women, the loss of ovarian function at menopause (typically about age 50) precipitates rapid bone loss.