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
The most common route of administration of insulin is: 
Select and explain. 
A. Intradermal, B. Subcutaneous, C. Intramuscular, D. Intravenous
B: Subcutaneous
Answer: B: Subcutaneous 
Explanation: None