This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Nervous system, Subject name: Physiology
Pacemaker regulating the rate of respiration is 
Select and explain. 
A. Pneumotaxic centre, B. Nucleus tractus solitarius, C. Apneustic centre, D. Pre-Botzinger complex
D: Pre-Botzinger complex
Answer: D: Pre-Botzinger complex 
Explanation: Pre-Botzinger complex initiates the respiratory rhythm, consists of six group of neurons that functions as "central pattern generator " for initiation of respiration. Located in the ventrolateral medulla. Ref: Ganong 25th ed/page 655