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': 'Normal creatinine level is: \nSelect and explain. \nA. 0.8 - 1.2 mg/dL, B. 1.0 - 2.0 mg/dL, C. 2.2 - 3.0 mg/dL, D. 3.0 - 3.8 mg/dL', 'role': 'user'}, {'content': 'Answer: A \nExplanation: 0.8 - 1.2 mg/dL', 'role': 'assistant'}]