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. Bromsulphalein test (BSP), B. Scrum transaminases, C. Hippuratc test, D. Gamma glutamyl transferase level
A: Bromsulphalein test (BSP)
Answer: A: 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.