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: Pediatrics
[{'content': 'Osmolarity of standard ORS solutions is ? \nSelect and explain. \nA. 245, B. 311, C. 330, D. 210', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Osmolarity of standard ORS solution is 245 mmol/l Reference: Ghai pediatrics eighth edition pg no 294', 'role': 'assistant'}]