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
All are causes of Osteoporosis, except: 
Select and explain. 
A. Thyrotoxicosis, B. Hypothyroidism, C. Chronic heparin therapy, D. Old age
B: Hypothyroidism
Answer: B: Hypothyroidism 
Explanation: Answer is B (Hypothyroidism) Osteoporosis is seen with hypehyroidism and not with hypothyroidism. Chronic heparin therapy, thyrotoxicosis and old age are all causes of osteoporosis