This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: FMT Q Bank, Subject name: Forensic Medicine
[{'content': 'True about acute carbolic acid poisoning is \nSelect and explain. \nA. Green colour urine is due to pyrocatechol & phenol, B. Results in local anesthesia, C. Results in thin & friable mucosa, D. Progressive weight loss, pigmentation of skin & sclera', 'role': 'user'}, {'content': "Answer: B \nExplanation: Phenol (carbolic acid) has local anesthetic propey because it destroys sensory nerve ending. Acute poisoning is called carbolism Dark colored urine, skin pigmentation, weight loss, loss of appetite are features of chronic poisoning called as phenolic marasmus. Oxidation of metabolites of phenol (pyrocatechol & hydroquinone) provides green color to urine. Phenol forms leathery stomach mucosa (i.e. increased thickness of mucosa) that's why gastric lavage can be done.", 'role': 'assistant'}]