This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Forensic Medicine
Tattooing in old decomposed body can be visualized by use of all except ? 
Select and explain. 
A. H2O2 3%, B. Gamma rays, C. Infrared photography, D. Examination with magnifying glass
B: Gamma rays
Answer: B: Gamma rays 
Explanation: Ans. is 'b' i.e., Gamma rays Latent tattoo marks are faded marks and they can be visualized by Use of ultraviolet light Infrared photograpy Rubbing the pa and examining under magnifying glass If tattoo marks are obscured by decomposition they can be visualized by treating with 3 % H2O2. Tatto marks can be developed by treating the skin by 0.5% caustic potash. Histopathology of local lymph nodes for pigment.