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
[{'content': 'Maximum dose of plain lignocaine (in mg) – \nSelect and explain. \nA. 300, B. 500, C. 700, D. 1000', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Maximum safe dose of plain lidocaine → 300 mg (4.5 mg/kg).\nMaximum safe dose of lidocaine with epinephrine → 500 mg (7 mg/kg).', 'role': 'assistant'}]