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
Who can be considerd as an expert witness- 
Select and explain. 
A. Medical men, B. Firearm expert, C. Chemical examiner, D. All
D: All
Answer: D: All 
Explanation: Expert witness (skilled witness): It refers to a witness who is skilled in some particular field.
e.g. Medical officer, firearm expert, chemical expert, finger print expert, hand writing expert and ballistic expert etc.