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
\r\nWhich of the following heavy metal poisoning may cause colitis that resembles diptheritic colitis? 
Select and explain. 
A. Lead, B. Arsenic, C. Mercury, D. Copper
C: Mercury
Answer: C: Mercury 
Explanation: Mercury colitis may resemble diptheritic colitis. Ref: Environmental and Chemical Toxins and Psychiatric Illness By James S Brown, Page 162; The Journal of Experimental Medicine