This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Forensic Medicine
Best method to group an old blood stain is 
Select and explain. 
A. Benzidine test, B. Spectroscopy, C. Absorption elusion, D. None of the above
C: Absorption elusion
Answer: C: Absorption elusion 
Explanation: Absorption elution method for blood grouping. Others for detecting presence of blood . Ref : Krishnan vij Textbook of Forensic medicine and Toxicology 5th edtion ; pg no - 67