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: Pharmacology
All are advantages of Zinc therapy for Wilson disease except: 
Select and explain. 
A. It is nontoxic, B. Produces positive copper balance, C. Blocks intestinal absorption of copper, D. Induces hepatic metallothionein synthesis
B: Produces positive copper balance
Answer: B: Produces positive copper balance 
Explanation: Zinc treatment in wilson disease: It is efficient in Wilson's disease Nontoxic Produces a negative copper balance by blocking intestinal absorption of copper It induces hepatic metallothionein synthesis, which sequesters additional toxic copper Ref: Harrison, E-18, P-3190.