This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Miscellaneous, Subject name: Anatomy
[{'content': 'The bullet which leave a color in its path is called \nSelect and explain. \nA. Piggy tail bullet, B. Tracer bullet, C. Incendiary bullet, D. Tandem bullet', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Tracer bullets are bullets which leave a color in their path. These bullets contain barium nitrate, magnesium, strontium nitrate, etc Ref: FORENSIC MEDICINE AND TOXICOLOGY Dr PC IGNATIUS THIRD EDITION PAGE 141', 'role': 'assistant'}]