Final answer:
Raloxifene is the drug classified as a selective estrogen receptor modulator (SERM) used in the treatment of osteoporosis.
Step-by-step explanation:
The pharmacological therapy for osteoporosis classified as a selective estrogen receptor modulator (SERM) that Joan is asking about is Raloxifene. Other options listed, such as Alendronate and Risedronate, are types of bisphosphonates, and Salmon calcitonin is a different class of drug altogether.
SERMs work by mimicking the effects of estrogen on bone, thus reducing bone resorption and preventing bone loss.