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: Surgery
Alagille syndrome is 
Select and explain. 
A. Bile duct paucity, B. IHBR dilation, C. PBC, D. PSC
A: Bile duct paucity
Answer: A: Bile duct paucity 
Explanation: Alagille syndrome is an autosomal dominant genetic disorder affecting liver,hea,kidney,etc.Liver biopsy in Alagille syndrome shows too few bile ducts(bile duct paucity) or in some cases,the complete absence of bile ducts(biliary atresia).Bile duct paucity results in reduced absorption of fat & vitamins(A,D,E,K) which may lead to rickets/a failure to thrive in children.