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': 'Content of potassium in reduced osmolarity ORS (mmol/litre) ? \nSelect and explain. \nA. 75, B. 65, C. 20, D. 10', 'role': 'user'}, {'content': "Answer: C \nExplanation: Ans. is 'c' i.e., 20", 'role': 'assistant'}]