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 gene affected in Gilber's syndrome is: 
Select and explain. 
A. UGT1A1, B. MRP2, C. Unknown, D. MRP 3
A: UGT1A1
Answer: A: UGT1A1 
Explanation: PARAMETER Syndrome GILBE'S CRIGLER- NAJJAR TYPE I CRIGLER-NAJJAR TYPE II DUBIN-JOHNSON ROTOR'S Incidence 6%-12% Very rare Uncommon Uncommon Rare Gene affected UGT1A1 UGT1A1 UGT1A1 MRP2 Unknown Metabolic defect |Bilirubin conjugation No bilirubin conjugation ||Bilirubin conjugation Impaired canalicular expo of conjugated bilirubin Impaired canalicular expo of conjugated bilirubin Ref: Sleisenger and Fordtran's, E-9, P-326