A 67-year-old woman with osteoporosis on BMD. No fractures.
- No history of fractures
- No tobacco use
- No excess alcohol
- Consumes adequate calcium and vitamin D
- History of breast cancer treated with surgery and radiation
- Family history negative for osteoporosis
- Exam normal
- Lab evaluation for secondary causes negative
- Fracture risk calculator moderate to high
What drug would you choose?

A. Estrogen
B. Calcitonin
C. Teriparatide
D. Alendronate