Social & Preventive Medicine The daily requirement of Vitamin D in infants and children is A 2.5 mcg (100 IU) B 10.0 mcg (400 IU) C 5.0 mcg (200 IU) D 20.0 mcg (800 IU) 💡 Explanation The daily requirement of Vitamin D in infants and children is ✓ Correct Answer: C. 5.0 mcg (200 IU)