This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Central Neuraxial Blockade, Subject name: Anaesthesia
The most common side effect of neuraxial opioid is: 
Select and explain. 
A. Nausea & vomiting, B. Pruritus, C. Urinary retention, D. Sedation
B: Pruritus
Answer: B: Pruritus 
Explanation: Pruritus is the most common side effect with neuraxial opioids. It may be generalized but is more likely to be localized to the face, neck or upper thorax. Treatment 1. naloxone 2. antihistaminic. 3. propofol