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': 'Current recommendations for minimum preoperative starving period for solid food (NPO for solid food]- \nSelect and explain. \nA. 4 hours, B. 6 hours, C. l0 hours, D. Overnight', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans: B. 6 hoursLight meal (Solid food) - 6hrs.Heavy meal (Fried foods/meat) - 8hrs.', 'role': 'assistant'}]