This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Fluids and Electrolyte Imbalance, Subject name: Medicine
Urinary anion gap is? 
Select and explain. 
A. Plus 1, B. 0, C. Minus 1, D. Cannot be calculated
B: 0
Answer: B: 0 
Explanation: Urinary anion gap (Na+ + K+ ) - (Cl- ) = 0 Urine is electro neutral *Anion gap in Blood = (Na+) - (Cl- + HCO3-)