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 cells of respiration are located in 
Select and explain. 
A. Pneumotaxic centre, B. Apneustic centre, C. Dorsal Respiratory Group, D. Pre - Botzinger complex
D: Pre - Botzinger complex
Answer: D: Pre - Botzinger complex 
Explanation: Pacemaker cells are in Pre - Botzinger complex which is a part of Ventral Respiratory Group.