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
Gun powder residues can be detec-ted by: 
Select and explain. 
A. Benzidine test, B. Barberios test, C. Dermal nitrate test, D. Hydrostatic test
C: Dermal nitrate test
Answer: C: Dermal nitrate test 
Explanation: Dermal nitrate test