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
Which of the following is true about Wilson disease- 
Select and explain. 
A. High copper in urine, high copper in serum, B. High ceruloplasmin, C. Low serum copper, D. Low urinary copper
C: Low serum copper
Answer: C: Low serum copper 
Explanation: None