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: Surgery
In osteoporosis, bone formation is increased by which drug - 
Select and explain. 
A. Bisphosphonates, B. Estrogen, C. Calcitonin, D. Teriparatide
D: Teriparatide
Answer: D: Teriparatide 
Explanation: Ans. is 'opl' i.e Teriparatide Drug used in osteoporosis Inhibit resorption Bisphosphonates, donesumab, cinacalcet, calcitonin, estrogen, SERMS, gallium nitrate. Stimulate formation :-Teriparatide, calcium, calcitriol, fluorides. Both actions Strontium renelate.