Which vitamin is listed as a supplement for osteoporosis?

• A. Vitamin C
• B. Iron
• C. Vitamin D
• D. Calcium

Answer: (C)

Vitamin D is essential for bone health because it enables the gut to absorb calcium, the main mineral in bone. When vitamin D levels are adequate, more calcium is absorbed and available for bone mineralization, helping to maintain bone density and reduce fracture risk. In osteoporosis management, supplementing vitamin D (often combined with calcium) helps ensure enough calcium is absorbed to support bone strength. Calcium is a mineral, not a vitamin, and while it matters for bones, the question specifically asks for a vitamin. Vitamin C and iron do not directly support osteoporosis treatment in the same way.