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
True about acute carbolic acid poisoning is 
Select and explain. 
A. 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
B: Results in local anesthesia
Answer: B: Results in local anesthesia 
Explanation: 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.