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: Anaesthesia
Concentration of adrenaline used with lignocaine 
Select and explain. 
A. 0.180555556, B. 1.430555556, C. 1:20000, D. 1:200000
D: 1:200000
Answer: D: 1:200000 
Explanation: local anaesthetic + adrenaline (1:200000) 

Fast onset
Less systemic toxicity 
Prolonged duration