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
The test used to diagnose Dubin .lohnson syndrome is- 
Select and explain. 
A. Scrum transaminases, B. Bromsulphalein test (BSP), C. Hippuratc test, D. Gamma glutamyl transferase level
B: Bromsulphalein test (BSP)
Answer: B: Bromsulphalein test (BSP) 
Explanation: 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