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
The most poisonous Mercury salt is: 
Select and explain. 
A. Chloride, B. Oxide, C. Cyanide, D. Chromate
A: Chloride
Answer: A: Chloride 
Explanation: A i.e. Chloride