This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Communicable diseases, Subject name: Social & Preventive Medicine
[{'content': 'Concentration of sodium in mOsm/l in low osmolar ORS is? \nSelect and explain. \nA. 45, B. 75, C. 90, D. 60', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Concentration of sodium in low osmolar ORS is 75 mOsm/l Osmolarity reduced to avoid possible adverse effects of hypeonicity on net fluid absorption by reducing the concentration of glucose and sodium chloride in the solution . Ref: PARK&;S TEXTBOOK OF PREVENTIVE AND SOCIAL MEDICINE 23rd edition pg 224', 'role': 'assistant'}]