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
Which of the following local anaesthetics are not vasodilators 
Select and explain. 
A. Lignocaine, B. Bupivacaine, C. Benzocaine, D. Tetracaine
A: Lignocaine
Answer: A: Lignocaine 
Explanation: Lignocaine has no vasogenic action.