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': 'Sodium content in mmol/L in WHO oral rehydration solution is - \nSelect and explain. \nA. 20, B. 80, C. 90, D. 111', 'role': 'user'}, {'content': "Answer: C \nExplanation: Ans. is 'c' i.e., 90", 'role': 'assistant'}]