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
[{'content': 'Which of the following factor determines the destructive power of bullet after firing? \nSelect and explain. \nA. Weight of bullet, B. Shape of bullet, C. Size of bullet, D. Velocity of bullet', 'role': 'user'}, {'content': "Answer: D \nExplanation: A bullet's ability to injure is directly related to its kinetic energy at the moment of impact. Kinetic energy i.e. E = mv2 /2 The kinetic energy is directly propoional to weight (mass) of the bullet and the square of its velocity. Thus a bullet traveling at twice the speed of a second bullet of equal weight and similar size and shape, possesses four times much energy and injuring power. Ref: The Essentials of Forensic Medicine and Toxicology by Narayan Reddy, 27th edition, Page 189.", 'role': 'assistant'}]