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: Medicine
[{'content': 'Edema is visible when the amount of fluid accumulated is: March 2013 (d, f) \nSelect and explain. \nA. 2-3 litres, B. 3-4 litres, C. 4-5 litres, D. 5-6 litres', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Ans. D i.e. 5-6 litres', 'role': 'assistant'}]