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': 'Renal vein thrombosis is/are caused by - \nSelect and explain. \nA. Nephrotic syndrome, B. Invasive renal cell carcinoma, C. Dehydration, D. All of the above', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]