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
JW 17 according to Grossman’s classification is 
Select and explain. 
A. Exploring instrument, B. Extirpating instrument, C. Cleaning and shaping instrument, D. Obturating instrument
A: Exploring instrument
Answer: A: Exploring instrument 
Explanation: None