This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Growth and development, Subject name: Pediatrics
Nutritional rickets is treated with a ----------- single dose of vitamin D 
Select and explain. 
A. 5000 mcg, B. 10000 mcg, C. 15000 mcg, D. 20000 mcg
C: 15000 mcg
Answer: C: 15000 mcg 
Explanation: In cases of nutritional rickets and vitamin D deficiency, treatment is simple. The first step is to prevent the complications of calcium and phosphate deficiency by correcting any abnormal levels with supplemental calcium or phosphate as well as the activated vitamin D (calcitriol). Ref.nelson 20th edition page 339 nutrition chapter