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
[{'content': 'Which of the following local anesthetic should not be mixed with adrenaline \nSelect and explain. \nA. Lignocaine, B. Bupivacaine, C. Mepivacaine, D. Cocaine', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Cocaine is a vaso constrictor by itself and hence should be avoided along with adrenaline.', 'role': 'assistant'}]