This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pharmacology
Which of the following is present intracellularly in muscle cells - 
Select and explain. 
A. Insulin, B. Coicosteroid, C. Epinephrine, D. Glucagon
B: Coicosteroid
Answer: B: Coicosteroid 
Explanation: Ans. is `b' i.e., Coicosteroids o Insulin, epinephrine and glucagon act on membrane receptors. o Coicosteroids act on intracellular (cytoplasmic receptors).