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: Orthopaedics
All of the following agents decreases bone resorption in osteoporosis, Except - 
Select and explain. 
A. Alendronate, B. Etidronate, C. Strontium, D. Teriparatide
D: Teriparatide
Answer: D: Teriparatide 
Explanation: A drug used in osteoporosis

Inhibit resorption: - Bisphosphonates, denosumab, cinacalcet, calcitonin, estrogen, SERMS, gallium nitrate.
Stimulateformation : -Teriparatide, calcium, calcitrial, fluorides,.
Both actions : - Strontium, renelate.


Drugs decreasing bone resorption initially increase bone mineral density (BMI), but it reaches a plateau in 2-3 yrs because bone formation also decreases.
On the other hand, drugs promoting bone formation can increase BMD through the period of treatment.