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
[{'content': 'Following cells are responsible for acid secretion in kidney? \nSelect and explain. \nA. I cells, B. P cells, C. Mesangial cell, D. Pericytes', 'role': 'user'}, {'content': 'Answer: A \nExplanation: A i.e. I cells Specialized', 'role': 'assistant'}]