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': 'If thiopentone is injected accidently into an artery the first symptom is – \nSelect and explain. \nA. Analgesia, B. Paralysis, C. Skin ulceration, D. Pain', 'role': 'user'}, {'content': 'Answer: D \nExplanation: First symptom of inadverent intra-arterial injection is pain and first sign is blanching.', 'role': 'assistant'}]