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
The local anaesthetic toxicity is maximally seen with? 
Select and explain. 
A. Epidural, B. Intercostal space, C. Caudal space, D. Sciatico-femoral nerve block
B: Intercostal space
Answer: B: Intercostal space 
Explanation: 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.