This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Pre Anesthetic Evaluation, Subject name: Anaesthesia
[{'content': 'Patient should be kept nil orally for: \nSelect and explain. \nA. 4 hours, B. 6 hours, C. 8 hours, D. 12 hours', 'role': 'user'}, {'content': "Answer: B \nExplanation: for adults 6 hours for liquids and semisolids 8 hours for fried, fatty food Recommended Preoperative Fasting period for neonates and infants are 6 hours for solids/formula feeds/cow's milk 4 hours for breast milk Recommended Preoperative Fasting periods for all above 1 year of age are 2 hours for clear fluids 4 hours for breast milk 6 hours for light meal 8 hours for fried, fatty food For clear fluid new clinical Study has recommended for liberal approach and 2hrs is upgraded to 1 hr. If type of food is not specified NPO status should be 6 hrs.", 'role': 'assistant'}]