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
Normal anion gap metabolic acidosis is caused by- 
Select and explain. 
A. Cholera, B. Starvation, C. Ethlene glycol poisoning, D. Lactic acidosis
A: Cholera
Answer: A: Cholera 
Explanation: Metabolic Acidosis This calculation, normally 10 to 15 mmol/L, represents the unmeasured negative ions, predominantly albumin, in blood. Normal anion gap acidosis (low serum HCO3 but normal anion gap) is caused by excess bicarbonate loss from either the gut (diarrhea),cholera or kidney (renal tubular acidosis Ref Davidson 23rd edition pg 364