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': 'Guttman sign is seen in \nSelect and explain. \nA. Branchial plexus block, B. Supra clavicular block, C. Stellate ganglion block, D. None', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Guttman sign is ipsilateral nasal stuffiness seen in stellate ganglion block.', 'role': 'assistant'}]