This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Anesthesia, Subject name: Pharmacology
[{'content': 'Following accidental intra-aerial injection of thiopentone, which should not be done? \nSelect and explain. \nA. Remove the needle, B. Intra -aerial heparin, C. Intra-aerial papaverine, D. Do a stellate ganglion block', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Thiopental slows the activity of your brain and nervous system. Thiopental is used to help you relax before you receive general anesthesia with an inhaled medication.Thiopental may be used for other purposes not listed in this medication guide.', 'role': 'assistant'}]