The following are multiple choice questions (with answers) about medical knowledge.   **Question:** Active form of vitamin D in kidney is:   (A) 1 dihydroxy cholecalciferol   (B) 25 hydroxy cholecalciferol   (C) 1, 25 dihydroxy cholecalciferol   (D) 7 dihydroxy calciferol
['(C) 1, 25 dihydroxy cholecalciferol <> answer', 'The following are multiple choice questions (with answers) about medical knowledge. <> instruction', '(A) 1 dihydroxy cholecalciferol \n (B) 25 hydroxy cholecalciferol \n (C) 1, 25 dihydroxy cholecalciferol \n (D) 7 dihydroxy calciferol <> possible answers', '  Active form of vitamin D in kidney is: <> context@']