Biochemistry Which of the following is required for the conversion of 25-hydroxy-cholecalciferol to calcitriol? A 25-hydroxylase B 1-hydroxylase C UV light D 1,25-hydroxylase 💡 Explanation Which of the following is required for the conversion of 25-hydroxy-cholecalciferol to calcitriol? ✓ Correct Answer: B. 1-hydroxylase