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 bullet may produce key hole entry wound? \nSelect and explain. \nA. Tracer bullet, B. Tandem bullet, C. Dum-Dum bullet, D. Yawning bullet', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Yawning bullet is irregular pattern, thus producing key hole entry wound in some cases.', 'role': 'assistant'}]