<prompt> Drug X which inhibit the binding of RANKL to its receptor RANK in osteoporosis:TeriparatideAlendronateDenosumabEstrogen  <response>: Ans. C. DenosumabOsteoclasts express RANK receptor which on stimulation causes resorption of bone. Denosumab is monoclonal antibody which inhibit the binding of ligand to the receptor and thus play a role in osteoporosis. 