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': 'Mexiletine is an oral active congner of \nSelect and explain. \nA. Dopamine, B. Lidocaine, C. Dobutamine, D. levodopa', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is'b'i.e., LidocaineRef: Clinical pharmacology 3'd/e p. 501; KDT Vhle p. 531Mexiletine is an orally active congener of lidocaine.It is a local anaesthetic and an orally active antiarrhythmic; chemically and pharmacologically similar to lidocaine.", 'role': 'assistant'}]