This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General pharmacology, Subject name: Pharmacology
Receptors are located in the nucleus for all the following except 
Select and explain. 
A. Insulin, B. Vitamin D, C. Thyroxine, D. Vitamin A
A: Insulin
Answer: A: Insulin 
Explanation: Insulin receptors are enzyme-linked tyrosine kinase receptors on cell surface. nuclear or cytosolic receptors include steroid hormone,vit A, vit D, thyroid hormones Ref: HL Sharma 3rd ed Pg 66