This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Vitamins, Subject name: Biochemistry
[{'content': 'Vitamin acting on intranuclear receptors - \nSelect and explain. \nA. Vitamin K, B. Vitamin D, C. Vitamin E, D. Vitamin B1', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., Vitamin D o Two vitamins are considered as hormones which act on intranuclear receptors (steroid receptor famity). There are:-i) Vitamin A (retinoic acid)ii) Vitamin D", 'role': 'assistant'}]