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
Ram has a 4 ml lignocaine vial of 2% solution. How much lignocaine is present in 1 ml ? 
Select and explain. 
A. 2 mg, B. 8 mg, C. 20 mg, D. 200 mg
C: 20 mg
Answer: C: 20 mg 
Explanation: None