This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Intravenous Anesthetic Agents, Subject name: Anaesthesia
[{'content': 'Role of egg lecithin in propofol formulation is? \nSelect and explain. \nA. Acts as emulsifying agent, B. Acts as preservative, C. Acts as carrier vehicle, D. Acts as antibacterial', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Propofol is an insoluble drug that requires a lipid vehicle for emulsification. Current formulations of propofol use a soybean oil as the oil phase and egg lecithin as the emulsifying agent.', 'role': 'assistant'}]