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': 'Most common complication of celiac plexus block – \nSelect and explain. \nA. Pneumothorax, B. Postural hypotension, C. Retroperitoneal hemorrhage, D. Intra-arterial injection', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Orthostatic hypotension is the most common complication of celiac plexus block.', 'role': 'assistant'}]