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
[{'content': 'Color of dried semen becomes yellow to brown. Dried semen stain in clothes is identified by: \nSelect and explain. \nA. UV light, B. Spectroscopy, C. Magnifying lens, D. Infrared', 'role': 'user'}, {'content': 'Answer: A \nExplanation: When dried semen is examined under filtered ultraviolet light, they show a fluorescence of a bluish-white colour, which is not specific as other albuminous materials such as nasal, leucorrhoeal discharges and detergents also fluoresce. Fluorescence depends on choline of semen. Ref: The Essentials of Forensic Medicine and Toxicology, 27th edition, Page 369.', 'role': 'assistant'}]