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 of respiration? \nSelect and explain. \nA. Dorsal nuclear group, B. Apneustic centre, C. Pnemotaxic centre, D. Pre Botzinger complex', 'role': 'user'}, {'content': 'Answer: D \nExplanation: D i.e. Pre Botzinger complex', 'role': 'assistant'}]