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
[{'content': 'Adrenaline is added to Lignocaine injection for: March 2007 \nSelect and explain. \nA. Less bleeding at the site, B. Higher doses can be given, C. Prolonged duration of action, D. All of the above', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Ans. D: All of the above Adrenaline is a local vasoconstrictor, so using adrenaline only with sho acting agents such as Lignocaine has advantages, like: Less bleeding at the site (local infiltration). Less systemic absorption, and consequently lower toxicity and possibility of giving a higher dose. Prolonged duration of action.', 'role': 'assistant'}]