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
Role of egg lecithin in propofol formulation is? 
Select and explain. 
A. Acts as emulsifying agent, B. Acts as preservative, C. Acts as carrier vehicle, D. Acts as antibacterial
A: Acts as emulsifying agent
Answer: A: Acts as emulsifying agent 
Explanation: 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.