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': 'Gunshot residue on hands can be detected by: \nSelect and explain. \nA. Phenolphthalein test, B. Dermal nitrate test, C. Benzidine test, D. Hydrogen activation analysis', 'role': 'user'}, {'content': 'Answer: B \nExplanation: B i.e. Dermal nitrate test', 'role': 'assistant'}]