This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Ballistics, Subject name: Forensic Medicine
Primary and secondary markings over metal bullet help in? 
Select and explain. 
A. Identification of weapon, B. Identification of wound, C. Identification of person, D. Severity of tissue damage
A: Identification of weapon
Answer: A: Identification of weapon 
Explanation: Markings on the bullet are used to identify the gun used. Bullet finger printing -Study of comparison of markings on crime bullet & test bullet under comparison microscope Primary Marking/Class Characteristics: Produced by rifling groovesQ * Primary markings are used to identify the make & model of the guns involved. Secondary markings or individual/accidental characteristics Produced by irregularities by manufacturing process are different for each gun produced by same manufacturer. They are useful in identifying the specific gun which was fired.