This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Chronic Kidney Disease and Uremia, Subject name: Medicine
Clinical features of CRF/uraemia appear when renal function is reduced to - 
Select and explain. 
A. 70%, B. 50%, C. 30%, D. 20%
C: 30%
Answer: C: 30% 
Explanation: Ans- C. Appear at stage 3 Prominent at Stage 5