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
Barberio's test uses which of the following ? 
Select and explain. 
A. Picric acid, B. Acetic acid, C. Hydrochloric acid, D. Sulfuric acid
A: Picric acid
Answer: A: Picric acid 
Explanation: Ans. is 'a' i.e., Picric acid Barberio's test It is used to diagnose presence of seminal/ spermatic fluid. Procedure : A saturated aqueous or alcoholic solution of picric acid when added to spermatic fluid produces yellow needle - shaped rhombic crystals of spermine picrate. The reaction probably depends on the presence of the prostatic secretion.