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
Adrenaline is added to lignocaine to prolong its effect and decrease its absorption into blood stream in a ratio of : 
Select and explain. 
A. 1:50,000, B. 1:100,000, C. 1:200,000, D. 1:500,000
C: 1:200,000
Answer: C: 1:200,000 
Explanation: None