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': 'Nephrotic syndrome is characterized by: \nSelect and explain. \nA. Proteinuria, B. Oedema, C. Serum albumin <30 gm/L, D. All of the above', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]