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': 'Pacemaker regulating the rate of respiration: \nSelect and explain. \nA. Pneumotaxic center, B. Dorsal group of nucleus, C. Apneustic center, D. Pre Botzinger complex', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Pacemaker\xa0of\xa0respiration\xa0is Pre-Botzinger complex of neurons, which is a part of Ventral Respiratory Group(VRG)\xa0in medulla.', 'role': 'assistant'}]