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': 'Confirmatory test for blood stain: PGI 13 \nSelect and explain. \nA. Benzidine test, B. Spectroscopic study, C. Oho tolidine test, D. Tecihmann test', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Ans. Tecihmann test', 'role': 'assistant'}]