Scurvy treatment via vitamin C sources

Steps:

• Identify symptoms (weakness, fatigue, swollen joints, swollen gums) as classic signs of scurvy.
• Recall scurvy results from vitamin C deficiency, impairing collagen synthesis.
• Link treatment to foods rich in vitamin C to restore levels and heal tissues.
• Select oranges as the vitamin C source matching the deficiency.

Why D is correct:

• Scurvy is defined as ascorbic acid (vitamin C) deficiency; oranges provide bioavailable vitamin C to synthesize collagen and resolve symptoms.

Why the others are wrong:

• A: Iron treats anemia (fatigue from low hemoglobin), not gum/joint swelling.
• B: Calcium addresses bone disorders like osteoporosis, unrelated to soft tissue swelling.
• C: Vitamin D prevents rickets (bone deformities), not matching fatigue or gum issues.

Final answer: D