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 thipentone 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: Ref Ajay yadav 2/e p 73 Treatment of accidental intra aerial injection of thipentone is Immediately stop fuher injection Leave the needle at site Inject heparin through this needle Inject papaverine through this needle If vasodilators like papaverine are not available ,xylocaine can be used Brachial plexus or stellate gangling block should be done to relieve vasospasm