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: Medicine
[{'content': "Ryle's tube is best put in \nSelect and explain. \nA. Left lateral position, B. Sitting position with neck slightly flexed, C. Sitting position with neck slightly extended, D. Supine position", 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]