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
Which of the following are inactive during normal respiration? 
Select and explain. 
A. Pre-Botzinger complex, B. Dorsal respiratory group of neurons (DRG), C. Ventral respiratory group of neurons (VRG), D. Pneumotaxic Centre
C: Ventral respiratory group of neurons (VRG)
Answer: C: Ventral respiratory group of neurons (VRG) 
Explanation: Quite expiration is passive, the Ventral respiratory group of neurons is active only during deep breathing Ref: Ganong 25th ed/page 655