This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Endocrinology, Subject name: Biochemistry
[{'content': "The active transport of 'Ca' is regulated by _______ which is synthesized in kidneys: \nSelect and explain. \nA. Cholecalciferol, B. Ergosterol, C. 25-OH cholecalciferol, D. 1, 25-di OH-Cholecalciferol", 'role': 'user'}, {'content': 'Answer: D \nExplanation: Ans. D. 1, 25-di OH-Cholecalciferol1,25-DHCC is Vitamin D. It is synthesized in the body. The reactions takes place in the liver and kidney. Vitamin D is also known as a prohormone. It helps in the transport of calcium against the electrochemical gradient to promote mineralization of bones.', 'role': 'assistant'}]