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
All of the following agents act by intracellular receptors EXCEPT: 
Select and explain. 
A. Thyroid hormones, B. Vitamin D, C. Insulin, D. Steroids
C: Insulin
Answer: C: Insulin 
Explanation: The insulin receptor is located at outer membrane Pg.no.261KD TRIPATHI SEVENTH EDITION