This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Regional Anesthesia, Subject name: Anaesthesia
[{'content': 'Fastest to slowest route of absorption of local anaesthetic is? \nSelect and explain. \nA. Tracheal >Lumbar epidural > Intercostal block > Subcutaneous., B. Tracheal > Intercostal block > Lumbar epidural > Subcutaneous., C. Subcutaneous> Intercostal block > Lumbar epidural >Tracheal., D. Lumbar epidural > Intercostal block >Tracheal > Subcutaneous.', 'role': 'user'}, {'content': 'Answer: B \nExplanation: According, the rate of systemic absorption is greatest with intercostal nerve blocks followed by caudal, lumbar epidural, brachial plexus block femoral and sciatic nerve blocks. Sequence of systemic absorption IV > Tracheal > Intercostal block > Para cervical block > Caudal > Lumbar epidural > Brachial Plexus > Sciatic > Subcutaneous.', 'role': 'assistant'}]