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
[{'content': 'Pacemaker for respiration: \nSelect and explain. \nA. Pre-botzinger complex, B. Adipose tissue, C. All, D. None', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Pre-botzinger complex acts as pacemaker for respiration It shows restless membrane potential between-60to-40 mv', 'role': 'assistant'}]