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': 'Who can be considerd as an expert witness- \nSelect and explain. \nA. Medical men, B. Firearm expert, C. Chemical examiner, D. All', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Expert witness (skilled witness): It refers to a witness who is skilled in some particular field.\ne.g. Medical officer, firearm expert, chemical expert, finger print expert, hand writing expert and ballistic expert etc.', 'role': 'assistant'}]