The following are multiple choice questions (with answers) about medical knowledge.   **Question:** All of the following about Vitamin D metabolism are true except   (A) 25–α hydroxylation takes place in liver   (B) 1–α hydroxylation takes place in kidney   (C) Daily requirement in the absence of sun–light is 450-6001U/day   (D) Williams syndrome is associated with obesity, mental retardation, precocious puberty
['(D) Williams syndrome is associated with obesity, mental retardation, precocious puberty <> answer', 'The following are multiple choice questions (with answers) about medical knowledge. <> instruction', '(A) 25–α hydroxylation takes place in liver \n (B) 1–α hydroxylation takes place in kidney \n (C) Daily requirement in the absence of sun–light is 450-6001U/day \n (D) Williams syndrome is associated with obesity, mental retardation, precocious puberty <> possible answers', '  All of the following about Vitamin D metabolism are true except <> context@']