This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Trace evidences, Subject name: Forensic Medicine
Which of the following is used to differentiate race in seminal stains? 
Select and explain. 
A. Serum alkaline phosphatase, B. MHS 5, C. Peptidase A, D. Choline
C: Peptidase A
Answer: C: Peptidase A 
Explanation: Enzyme Typing: Enzyme markers commonly used in genetic profiling of semen are phosphoglutamase (PGM) and peptidase (Pep A). Pep A is polymorphic in many racial groups and is commonly employed as a racial discriminator. PGM is polymorphic in all populations and can be subdivided into 10 distinct subgroups.