This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: FMGE 2018, Subject name: Forensic Medicine
Confirmatory test of blood stain: 
Select and explain. 
A. Spectroscopic test, B. Kastle meyer test, C. Benzidine test, D. Ohotoluidine test
A: Spectroscopic test
Answer: A: Spectroscopic test 
Explanation: SCREENING TEST FOR BLOOD STAINS. I. Color test: 1. Benzidine test / Adler's test: BLUE +2. Phenolphthalein test : PINK +3. Ohotoludine test : BLUE + II. Luminescent test: 1. Luminol spray 2. UV Light CONFIRMATORY TEST FOR BLOOD STAINS. I. MICROSCOPY: To identify human RBC II. ABSORPTION spectroscopy: Definitive confirmatory test Most reliableUsed for recent / old stains. III. Microchemical test: 1. teichmann test / hemin crystal test 3. Takayama test / hemochromogen crystal