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
Characteristic postmortem finding of carbolic acid poisoning is 
Select and explain. 
A. Grunish stomach, B. Yellow charred stomach, C. Brown leathery stomoch, D. Black charred stomach
C: Brown leathery stomoch
Answer: C: Brown leathery stomoch 
Explanation: Stomach mucosa :

Sulphuric acid : Charred / Black  / blottin paper stomach
Copper sulphate : Bluish green
Ferrous sulphate : Green
Arsenic : pink velvety mucosa / strawberry
Nitric acid : yellow
Carbolic acid : White leathery stomach.