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': 'Gun powder residues can be detec-ted by: \nSelect and explain. \nA. Benzidine test, B. Barberios test, C. Dermal nitrate test, D. Hydrostatic test', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Dermal nitrate test', 'role': 'assistant'}]