This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: G.I.T, Subject name: Medicine
[{'content': 'The test used to diagnose Dubin .lohnson syndrome is- \nSelect and explain. \nA. Scrum transaminases, B. Bromsulphalein test (BSP), C. Hippuratc test, D. Gamma glutamyl transferase level', 'role': 'user'}, {'content': 'Answer: B \nExplanation: A prolonged BSP dye excretion test is diagnostic of Dubin Johnson syndrome BSP is a dye which is removed from circulation by the same mechanism as bilirubin. Reference Harsh mohan page no.593', 'role': 'assistant'}]