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: Pediatrics
[{'content': 'A 2-year-old child presented with diarrhoea and failure to thrive, Blood examination shows – Na = 122,K – 6. He is most probably suffering from – \nSelect and explain. \nA. Banter syndrome, B. 21–α Hydroxylase deficiency, C. 11–β Hydroxylase deficiency, D. 17–a Hydroxylase deficiency', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Na+ is 122 (hyponatremia). That means, there is salt losing enzyme deficiency, causing hyponatremia and hyperkalemia.\n21 hydroxylase deficiency causes hyponatremia and hyperkalemia. 17α -hydroxylase and 11-β -( hydroxylase deficiency cause hypernatremia and hypokalemia.\nButter syndrome causes excessive loss of Na+, K+ and Cl causing severe hypokalemia and hyponatremia.', 'role': 'assistant'}]