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
Pacemaker of respiration 
Select and explain. 
A. Dorsal nuclear group, B. Apneustic centr, C. Pnemotaxic centre, D. Pre Botzingeer complex
D: Pre Botzingeer complex
Answer: D: Pre Botzingeer complex 
Explanation: None