This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Poisoning, 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: alcohols,long acting barbiturates,chloral hydrate,lithium,salicylates,bromide,inorganic mercury,quinidine,theophylline,and sodium chlorate are effectively removed by peritoneal dialysis hemodialysis is used in methanol,ethylene glycol,chloral hydrate,lithium,trivalent arsenic,acetaminophen,bromides,phenobarbital,salycylates,flourides,sodium chlorate,digitalis,methaqualone,boric acid,and thiocyanates REF:THE SYNOPSIS OF FORENSIC MEDICINE AND TOXICOLOGY:K S NARAYANA REDDY;PAGE NO 289