This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Intravenous Anesthetic Agents, Subject name: Anaesthesia
[{'content': 'All true about accidental intraerial injection of thiopentone except- \nSelect and explain. \nA. Immediate intense vasoconstriction and excruciating pain, B. Cause is precipitation of thiopental crystalls in the aerial vessels, C. To relieve pain we have to immediately remove the misplaced aerial cannula, D. Stellate ganglion block is one of the treatment modality', 'role': 'user'}, {'content': 'Answer: C \nExplanation: The accidental intraerial injection of drug by wrongly placed cannula M/N- 1 Leave the cannula 2 Intraerial injection of heparin 3 Lidocaine, papaverine, phenoxybenzamine injected 4 Stellate ganglion block', 'role': 'assistant'}]