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
Vitamin acting on intranuclear receptors - 
Select and explain. 
A. Vitamin K, B. Vitamin D, C. Vitamin E, D. Vitamin B1
B: Vitamin D
Answer: B: Vitamin D 
Explanation: 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