This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Fluid and electrolytes, Subject name: Medicine
Acute metabolic acidosis 
Select and explain. 
A. Has biphasic effect on K+ exceion, B. Does not effect K+ excretion significantly, C. Decreases urinary K+ exceion, D. Increases urinary K+ excretion
C: Decreases urinary K+ exceion
Answer: C: Decreases urinary K+ exceion 
Explanation: It is seen in low anion gap acidosis. Other features seen: low serum albumin (nephrotic syndrome.) High immunoglobulins (multiple myeloma) Increaed Li Increaed : K+, Ca2+, Mg2+ Ref: Harrison&;s 19thE