This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: NEET 2018, Subject name: Orthopaedics
Which drug increase the bone formation in osteoporosis? 
Select and explain. 
A. Teriparatide, B. Risedronate, C. Calcitonin, D. Denosumab
A: Teriparatide
Answer: A: Teriparatide 
Explanation: * Increased bone formation: Parathyroid hormone, Teriparatide, Fluoride* Decreased bone resorption: Bisphosphonates, calcitonin, denosumab, estrogen * Drug performing both the action: Strontium