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': 'Dried Semen stains on clothes identified by: \nSelect and explain. \nA. Spectrometry, B. UV rays, C. Infrared rays, D. LASER', 'role': 'user'}, {'content': 'Answer: B \nExplanation: B i.e. UV rays When examined under filtered ultraviolet (UV) light, seminal fluid (semen) show a fluorescence of bluish white colourQ, which is not specific as other albuminous materials such as nasal, leucorrhoeal discharges, detergents and stains of urine also fluoresce.', 'role': 'assistant'}]