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: Pediatrics
What is the mechanism by which Phenoparbitons and Metalloporphysin act respectively to reduce bilirubin levels in neonatal jaundice 
Select and explain. 
A. Enhance secretion of conjugated bilirubin and induce bilirubin conjugation by UDP Glucuronyltransferare, B. Induce bilirubin conjugation by UDP Glucuronyltransferare and competitive inhibition of hemeoxygenase, C. Induce bilirubin conjugation by UDP Glucuronyltransferare and enhance secretion of conjugated bilirubin, D. Competitive inhibition of hemeomygenase and enhance secretion of conjugated bilirubin
B: Induce bilirubin conjugation by UDP Glucuronyltransferare and competitive inhibition of hemeoxygenase
Answer: B: Induce bilirubin conjugation by UDP Glucuronyltransferare and competitive inhibition of hemeoxygenase 
Explanation: Phenobarbitone:
It induces UDP Glucuromyltransferase
↓
Increase Bilirubin conjugation
Metalloporphyrins:
It is competitive inhibitor of hence oxygenase, which converts hence to bilirubin.