This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Nephrotic and Nephritic syndrome, Subject name: Medicine
[{'content': 'Clinical features of Uraemia will appear when GFR is < ___ml/min/ 1.73 m2? \nSelect and explain. \nA. 15, B. 30, C. 45, D. 60', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Development of: Uraemia <15 ml/min/1.73m2 Acidosis, hyperkalemia 15-29 ml/min/1.73m2 Anemia 30-59 ml/min/1.73m2 Hypeension 60-89 ml/min/1.73m2', 'role': 'assistant'}]