This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Kidneys and Body Fluids, Subject name: Physiology
The plasma clearance value of glucose in a diabetes mellitus patient will be 
Select and explain. 
A. Zero, B. Equal to that of inulin clearance, C. Greater than that of PAH clearance, D. Greater than zero
D: Greater than zero
Answer: D: Greater than zero 
Explanation: Ans. (d) Greater than zero(Ref: Ganong, 25th ed/p.678)Diabetes mellitus is characterized by renal glycosuria. Glucose appears in urine. So, plasma clearance of glucose is greater than zero