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
Shortest acting local anaesthetic agent is – 
Select and explain. 
A. Procaine, B. Lidocaine, C. Tetracaine, D. Bupivacaine
A: Procaine
Answer: A: Procaine 
Explanation: Chlorprocaine is the shortest acting LA. Amongst the given options procaine is shortest acting.