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': 'Spinal anesthesia is given at which of the following levels? \nSelect and explain. \nA. Ll-2, B. L2-4, C. Midline of thorax, D. Below L5 (caudal)', 'role': 'user'}, {'content': 'Answer: B \nExplanation: The anesthetic is injected in the mid-lower sub-arachnoid space into the cerebrospinal fluid mostly below the L2 level. Among the given options, L2-L4 is the site for spinal anesthesia. In order to avoid spinal cord injury, this procedure is usually not performed above L2 in adults. Ref: Spinal & epidural anesthesia - By Cynthia A. Wong, Cynthia Wong; Page 33 - 38; A Practical Approach to Regional Anesthesia - By Michael F. Mulroy, Christopher M. Bernards, Susan B. McDonald, Francis V. Salinas.', 'role': 'assistant'}]