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
Which of the following method is used to demonstrate blackening and tattooing of skin and clothing? 
Select and explain. 
A. Magnifying lens, B. Luminol spray, C. Ultraviolet light, D. Infrared photography
D: Infrared photography
Answer: D: Infrared photography 
Explanation: Infrared photography is used to detect tattoos on cloth or skin. Ref: Dating and Age Determination of Biological Materials By Michael R. Zimmerman, John Lawrence Angel, Page 170