The duration of effect of a regional anesthetic depends on

After surgery, numbness and weakness persist for a period of time that depends on the location of the injection and the type of anesthetic medication. Some forms of regional anesthesia can last up to 24 hours. Spinal anesthesia may cause difficulty urinating in the first several hours after surgery until bladder sensation returns.

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the answer is c   it wants me to write more for no reason bu c is the answer