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': 'Cause for renal vein thrombosis could be -a) Membranous nephropathyb) Lupus nephritisc) Membranoproliferative glomerulonephritisd) Post streptococcal glomerulonephritise) Renal amyloidosis \nSelect and explain. \nA. acd, B. ace, C. cde, D. ade', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]