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 3-month-old male child with normal genitalia presents to the emergency department with severe dehydration, hyperkalemia, and hyponatremia. The measurement blood levels of which of the following will be helpful? \nSelect and explain. \nA. Renin, B. Cortisol, C. Aldosterone, D. 17-hydroxy progesterone', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]