**Question:** Treatment of post menopausal osteoporosis are all EXCEPT

A. Calcitonin
B. Sodium fluoride
C. Parathyroid hormone
D. Estrogen replacement therapy

**Correct Answer:** C. Parathyroid hormone

**Core Concept:** Osteoporosis is a skeletal disorder characterized by low bone mass and microarchitectural deterioration of bone tissue, leading to an increased risk of fractures. Post-menopausal osteoporosis primarily affects women due to the significant decline in estrogen levels following menopause.

**Why the Correct Answer is Right:** Parathyroid hormone (PTH) is a hormone produced by the parathyroid glands, primarily regulating calcium and phosphorus homeostasis in the body. In the context of osteoporosis, PTH increases calcium levels in the blood by stimulating bone resorption and renal calcium reabsorption, which would lead to further deterioration of bone tissue and exacerbate osteoporosis.

**Why Each Wrong Option is Incorrect:**

A. Calcitonin: Calcitonin is a hormone secreted by the thyroid gland that plays a crucial role in regulating calcium homeostasis. In the context of osteoporosis, calcitonin acts as a bone-protective agent, reducing bone resorption and thus aiding in the management of osteoporosis.

B. Sodium fluoride: Fluoride is added to drinking water and toothpaste to prevent dental caries. Although sodium fluoride may have some effect on bone mineralization, it is not a targeted therapy for osteoporosis.

D. Estrogen replacement therapy: Estrogen replacement therapy is a crucial component in the treatment of post-menopausal osteoporosis, as it helps to maintain bone mineral density by reducing bone resorption and promoting bone formation.

**Clinical Pearl:** Estrogen replacement therapy is essential in managing post-menopausal osteoporosis, while calcitonin, sodium fluoride, and PTH are not suitable options for treating this condition due to their different roles in calcium homeostasis and bone remodeling. In contrast, estrogen replacement therapy directly targets bone health and is widely used in the management of osteoporosis.