This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Vitamins and Minerals, Subject name: Biochemistry
[{'content': 'Steroidal prohormone is: \nSelect and explain. \nA. Vitamin A, B. Vitamin C, C. Vitamin D, D. None of these', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ans. C. Vitamin DVitamin D is a steroid prohormone. It is represented by steroids that occur in animals, plants and yeast. Active form of the hormone is 1, 25-dihydroxy vitamin D3 (1, 25-(OH)2D3, also termed calcitriol). Calcitriol functions primarily to regulate calcium and phosphorous homeostasis.', 'role': 'assistant'}]