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