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
[{'content': 'Among the local anaesthetics, the one that is associated with vasoconstriction is lidocaine which is used with Adrenaline in a concentration of : \nSelect and explain. \nA. 1:20, B. 0.180555556, C. 1.430555556, D. 1:200000', 'role': 'user'}, {'content': 'Answer: D \nExplanation: 1:200000', 'role': 'assistant'}]