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
A person was found dead with bluish green frothy discharge at the angle of mouth and nostrils. Probable cause can be: AIIMS 12 
Select and explain. 
A. Arsenic poisoning, B. Copper poisoning, C. Mercury poisoning, D. Lead poisoning
B: Copper poisoning
Answer: B: Copper poisoning 
Explanation: Ans. Copper poisoning