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: Social & Preventive Medicine
[{'content': 'What is the total osmolarity of low osmolarity ORS? \nSelect and explain. \nA. 311 mmol/ litre, B. 300 mmol/ litre, C. 245 mmol/ litre, D. 250 mmol/ litre', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Composition of reduced osmolarity ORS: Components Amount in mmol/ litre Sodium 75 Chloride 65 Glucose, anhydrous 75 Potassium 20 Citrate 10 Total osmolarity 245 Ref: Park 21st edition, page 202.', 'role': 'assistant'}]