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: Anatomy
[{'content': 'The second stage of deglutition is characterized by \nSelect and explain. \nA. Elevation of larynx, B. Momentary apnoea, C. Peristalsis of Pharyngo esophageal sphincter, D. Relaxation of pharyngeal constrictors', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]