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 the detection of- \nSelect and explain. \nA. Gunpowder residue, B. Seminal stains, C. Blood stains, D. Saliva', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]