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: Medicine
The completeness of a 24-hour urine collection is best assessed by the simultaneous measurement of urinary - 
Select and explain. 
A. Volume, B. Urea, C. Creatinine, D. pH
C: Creatinine
Answer: C: Creatinine 
Explanation: None