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
A 30 year old lady is to undergo surgery under intravenous regional anesthesia for her left 'trigger finger'. Which one of the following should not be used for patient ? 
Select and explain. 
A. Lignocaine, B. Bupivacaine, C. Prilocaine, D. Lignocaine + ketorolac
B: Bupivacaine
Answer: B: Bupivacaine 
Explanation: Bupivacaine is contraindicated for intravenous regional anesthesia (Bier's block).