This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Physiology
All are true regarding vitamin D, except ? 
Select and explain. 
A. Sunlight is impoant, B. 1-hydroxylation in liver, C. Active form is calcitriol, D. RDA is for children is 400 IU
B: 1-hydroxylation in liver
Answer: B: 1-hydroxylation in liver 
Explanation: Ans. is 'b' i.e., 1-hydroxylation in liver