This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General anatomy, Subject name: Anatomy
Pacemaker for respiration: 
Select and explain. 
A. Pre-botzinger complex, B. Adipose tissue, C. All, D. None
A: Pre-botzinger complex
Answer: A: Pre-botzinger complex 
Explanation: Pre-botzinger complex acts as pacemaker for respiration It shows restless membrane potential between-60to-40 mv