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: Anaesthesia
Local anesthetics are typically injected or applied very close to their intended site of action. From which of the following routes absorption of local anaesthetic is maximum? 
Select and explain. 
A. Intercostal, B. Epidural, C. Brachial, D. Caudal
A: Intercostal
Answer: A: Intercostal 
Explanation: The rate of systemic absorption is propoionate to the vascularity of the site of injection: intravenous > tracheal > intercostal > caudal > paracervical > epidural > brachial plexus > sciatic > subcutaneous. Ref: Morgan, Jr. G.E., Mikhail M.S., Murray M.J. (2006). Chapter 14. Local Anesthetics. In G.E. Morgan, Jr., M.S. Mikhail, M.J. Murray (Eds), Clinical Anesthesiology, 4e.