This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Toxicology - 1, Subject name: Forensic Medicine
Which is not a mechanism of action of corrosive poison 
Select and explain. 
A. Free radical oxidative injury, B. Extracting water from tissues, C. Coagulation of proteins, D. Conve haemoglobin to hematin
A: Free radical oxidative injury
Answer: A: Free radical oxidative injury 
Explanation: Corrosives - mechanism of action - Corrosive poison erodes the surface in contact by extracting water from local tissue, coagulation of protein, conve hemoglobin to hematin.