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: Surgery
[{'content': '3 ml of LA solution contains 2% lignocaine with 1:100000 epinephrine how many milligrams of each are present in the solution? \nSelect and explain. \nA. 6mg lidocaine, 0.3mg epinephrine, B. 60 mg lidocaine, 0.03 mg epinephrine, C. 6 mg lidocaine, 0.03 mg epinephrine, D. 600 mg lidocaine, 0.3 mg epinephrine', 'role': 'user'}, {'content': "Answer: B \nExplanation: Learn the following facts, and you can solve all numerical of LA.\n\n% (per cent--'cent' means 100) means g/100ml, so 2% lignocaine means 2g/100ml, or 2000mg/100ml of solution = 20mg/ml.\n1 cartridge contains around 2 ml solution. \nThus, 3 ml\xa0contains 60mg lidocaine. \n\n\xa0\n\n1 in 1\xa0lakh\xa0adrenaline means 1g in 1\xa0lakh\xa0ml or 1000mg Adr in 1,00,000\xa0ml solution = 1000/100000 = 0.01mg/ml\nThus, 3ml contains 0.03mg adrenaline.\n\nTo know:\n\nSafe dose of LA (with or without Adr) = 7mg/kg body weight.\nSafe dose of Adr in healthy patient = 0.2 mg\nSafe dose of Adr in cardiac patient = 0.04 mg", 'role': 'assistant'}]