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

Immediately stop the further injection.
Leave the needle at the 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 ganglion block should be done to relieve vasospasm.