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
Test used for Dubin Johnson syndrome? 
Select and explain. 
A. Gamma Glutamyl Transferase, B. Serum Amylase Test, C. Bromosulphalein test, D. Hippuric acid test
C: Bromosulphalein test
Answer: C: Bromosulphalein test 
Explanation: None