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 should be discarded \nSelect and explain. \nA. After 6 hours 13., B. After 12 hours, C. After 24 hours, D. After 36 hours', 'role': 'user'}, {'content': 'Answer: C \nExplanation: After 24 hours', 'role': 'assistant'}]