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: Unknown
Gene for Wilson's disease is ? 
Select and explain. 
A. ATP7B, B. B, C. C, D. D
A: ATP7B
Answer: A: ATP7B 
Explanation: Ans is 'a' i.e. ATPB7 o Wilson's disease is an autosomal recessive disorder of copper metabolism caused by mutation of ATP7 B gene on the long arm of chromosome 13. ATP7 B gene encodes 'p-type' ATP responsible for copper excretion and incorporation into ceruloplasmin in the liver. The defect in ATP7 B gene results in copper accumulation in the liver (primarily) and other organs like eye and CNS.