This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Metabolic Disorders Leading to Osteosclerosis, Subject name: Orthopaedics
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 'd' i.e., TeriparatideDrug used in osteoporosisInhibit resorption Bisphosphonates, donesumab, cinacalcet, calcitonin, estrogen, SERMS, gallium nitrate.Stimulate formation .-Teriparatide, calcium, calcitriol, fluorides.Both actions:- Strontium renelate.