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
Which of the following is not altered by rifling a gun? 
Select and explain. 
A. Prevents wobbling of the bullet, B. Improves greater power of penetration of bullet, C. Decreases the smoke from the barrel, D. Impas gyroscopic stability of bullet
C: Decreases the smoke from the barrel
Answer: C: Decreases the smoke from the barrel 
Explanation: Advantages of rifling a gun: Impas gyroscopic stability Increases accuracy and range Prevents wobbling or tumbling end-over-end Gives greater power of penetration