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: Anaesthesia
Intra aireal injection of thiopentone causes: 
Select and explain. 
A. Vasospasm, B. Vasodialation, C. Necrosis of vessel wall, D. Hypotension
A: Vasospasm
Answer: A: Vasospasm 
Explanation: A i.e. Vasospasm