This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, 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: Drug used in osteoporosisInhibit resorption: Bisphosphonates, denosumab, cinacalcet, calcitonin, estrogen, SERMS, gallium nitrateStimulate formation: teriparatide, calcium, calcitriol, fluoridesBoth actions: Strontium renelate(Refer: Mohindra's Fundamentals of Ohopedics, 2nd edition, pg no. 400 - 412)