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
[{'content': 'Which is not a mechanism of action of corrosive poison \nSelect and explain. \nA. Free radical oxidative injury, B. Extracting water from tissues, C. Coagulation of proteins, D. Conve haemoglobin to hematin', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Corrosives - mechanism of action - Corrosive poison erodes the surface in contact by extracting water from local tissue, coagulation of protein, conve hemoglobin to hematin.', 'role': 'assistant'}]