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
Following accidental intra-aerial injection of thiopentone, which should not be done? 
Select and explain. 
A. Remove the needle, B. Intra -aerial heparin, C. Intra-aerial papaverine, D. Do a stellate ganglion block
A: Remove the needle
Answer: A: Remove the needle 
Explanation: 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.