This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Regional anaesthesia, Subject name: Anaesthesia
[{'content': 'Not a sign of stellate ganglion block \nSelect and explain. \nA. Miosis, B. exopthalomoss, C. Nasal congestion, D. Conjunctival redness', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Horner syndrome is a sign of stellate ganglion block (miosis, enopthalmos,ptosis, anhydrosis and absence of cliospinal reflex', 'role': 'assistant'}]