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
What is the reason for choking shot gun? 
Select and explain. 
A. Imparts spinning motion to pellet, B. Decreases the velocity of pellet, C. Reduces pellets dispersion, D. All of the above
C: Reduces pellets dispersion
Answer: C: Reduces pellets dispersion 
Explanation: None