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
Confirmatory test for blood stain: PGI 13 
Select and explain. 
A. Benzidine test, B. Spectroscopic study, C. Oho tolidine test, D. Tecihmann test
D: Tecihmann test
Answer: D: Tecihmann test 
Explanation: Ans. Tecihmann test