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 not seen in: 
Select and explain. 
A. Thyrotoxicosis, B. Rheumatoid arthritis, C. Postmenopausal women, D. None of the above
D: None of the above
Answer: D: None of the above 
Explanation: None