This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: FMGE 2018, Subject name: Pediatrics
A child with diarrhea has deep & rapid respiration. Most likely diagnosis is: 
Select and explain. 
A. Respiratory acidosis, B. Respiratory alkalosis, C. Metabolic acidosis, D. Metabolic alkalosis
C: Metabolic acidosis
Answer: C: Metabolic acidosis 
Explanation: Diarrhoea- lose of bicarbonate in stool- causes normal anion gap metabolic acidosis. Deep & rapid respiration- compensatory mechanism