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': 'Dermal nitrate test is done for \nSelect and explain. \nA. Sperm, B. Blood, C. Corrosive, D. Gun powder', 'role': 'user'}, {'content': 'Answer: D \nExplanation: D i.e. Gun powder', 'role': 'assistant'}]