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: Forensic Medicine
All of the following poison's are dialyzable except- 
Select and explain. 
A. Ethylene glycol, B. Methanol, C. Barbiturates, D. Copper sulphate
D: Copper sulphate
Answer: D: Copper sulphate 
Explanation: Hemodialysis is not useful in copper sulfate poisoning. It is useful in poisoning with other three given options.