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
Instrument that has a 4-digit formula: 
Select and explain. 
A. Angle Former, B. Hoe, C. Hatchet, D. Spoon Excavator
A: Angle Former
Answer: A: Angle Former 
Explanation: None