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: Physiology
[{'content': 'True regarding respiratory center is \nSelect and explain. \nA. Directly stimulated by fall in PaO2, B. Inhibited during swallowing, C. Connected with cardiac center, D. Situated in midbrain', 'role': 'user'}, {'content': 'Answer: B \nExplanation: B i.e. Inhibited during swallowing', 'role': 'assistant'}]