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': 'ORS contains 75 m moUlitre- \nSelect and explain. \nA. Sodium, B. Potassium, C. Glucose, D. Chloride', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Sodium o Because of the improved effectiveness of reduced osmolarity ORS solution, WHO and UNICEF are recommending that countries manufacture and use the following formulation in place of the previously recommended ORS solution.", 'role': 'assistant'}]