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: Dental
Diamond abrasive having particle size of 125-150 µm is classified? 
Select and explain. 
A. Fine, B. Coarse, C. Medium, D. Extrafine
B: Coarse
Answer: B: Coarse 
Explanation: Diamond particle size is commonly categorized as coarse (125–150 µm), medium (88–125 µm), fine (60–74 µm) and very fine (38–44 µm) for diamond preparation instruments.
Sturdevants operative dentistry 4th edition page 338