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': 'Ram has a 4 ml lignocaine vial of 2% solution. How much lignocaine is present in 1 ml ? \nSelect and explain. \nA. 2 mg, B. 8 mg, C. 20 mg, D. 200 mg', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]