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
The test used to diagnose Dubin Johnson syndrome is - 
Select and explain. 
A. Serum transaminases, B. Bromsulphalein test (BSP), C. Hippurate test, D. Gamma glutamyl transferase level
B: Bromsulphalein test (BSP)
Answer: B: Bromsulphalein test (BSP) 
Explanation: None