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': 'The amount of vasoconstrictor in 1 ml of 2% Lignocaine solution with 1:2,00,000 adrenaline is: \nSelect and explain. \nA. 0.5 mg, B. 0.05 mg, C. 0.005 mg, D. 0.0005 mg', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]