Active form of vitamin D in kidney is_____________? September 27, 2025 by Admin A. 1 dihydroxy cholecalciferol B. 25 hydroxy cholecalciferol C. 1,25 dihydroxy cholecalciferol D. 7 dihydroxy calciferol ✅ The correct answer is option C. 1,25 dihydroxy cholecalciferol.