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
[{'content': 'Absorption of injected local anesthetics depends on various factors. Fastest route of absorption of local anaesthetic is: \nSelect and explain. \nA. Intercostal, B. Epidural, C. Brachial, D. Caudal', 'role': 'user'}, {'content': 'Answer: A \nExplanation: 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.', 'role': 'assistant'}]