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
Wilson's Disease is caused by mutation of which of the following gene? 
Select and explain. 
A. ATP 7A gene, B. ATP7B gene, C. ATP8A gene, D. ATP8B gene
B: ATP7B gene
Answer: B: ATP7B gene 
Explanation: Wilson's disease is an autosomal recessive disorder caused by mutations in the ATP7B gene. Clinical manifestations are caused by copper toxicity and primarily involve the liver and the brain. Reference: Harrisons Principles of Internal Medicine, 18th Edition, Page 3188