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
Among the local anaesthetics, the one that is associated with vasoconstriction is lidocaine which is used with Adrenaline in a concentration of : 
Select and explain. 
A. 1:20, B. 0.180555556, C. 1.430555556, D. 1:200000
D: 1:200000
Answer: D: 1:200000 
Explanation: 1:200000