Physiology General 5b31bc06 All are true about Vitamin D except: A 25-hydroxylation occurs in the liver B 1-(x hydroxylation occurs in the kidneys C In the absence of sunlight, the minimum daily requirement is 400-600 IU D William's syndrome consists of mental retardation, obesity and precocious pubey High-Yield Explanation D i.e. Williams syndrome consists of mental retardation, obesity & precocious pubey