This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Human identification, Subject name: Forensic Medicine
[{'content': 'Tattooing in old decomposed body can be visualized by use of all except: \nSelect and explain. \nA. 3% H2O2, B. Gamma rays, C. Infrared photography, D. Examination with magnifying lens', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Tattoo Marks Faint or disappeared tattoo marks can be made out on histological study of the regional lymph nodes In decomposed bodies, they are made visible by treating the area with 3 % hydrogen peroxide Methods to demonstrate old or faint tattoos visible: Infra red photography UV lamp Magnifying glass High contrast photography', 'role': 'assistant'}]