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
Blackening and tattooing of skin and clothing can be best demonstrated by: 
Select and explain. 
A. Luminol spray, B. Infrared photography, C. Ultraviolet light, D. Magnifying lens
B: Infrared photography
Answer: B: Infrared photography 
Explanation: B i.e. Infrared photography