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': 'The test used to diagnose Dubin Johnson syndrome is - \nSelect and explain. \nA. Serum transaminases, B. Bromsulphalein test (BSP), C. Hippurate test, D. Gamma glutamyl transferase level', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]