This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Renal physiology, Subject name: Physiology
[{'content': 'Rennin is present in \nSelect and explain. \nA. Gastric juice, B. Liver, C. Kidney, D. Lung', 'role': 'user'}, {'content': "Answer: A \nExplanation: Rennin is present in the Gastric juice whereas Renin is related to kidney. Ref: Ganong's review of medical physiology; 24th edition", 'role': 'assistant'}]