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
Following movement of tip is seen in Giromatic hand piece: 
Select and explain. 
A. Reciprocating 90° arc, B. 180° arc, C. Oscillating to and fro moments, D. Vertical displacement of tip
A: Reciprocating 90° arc
Answer: A: Reciprocating 90° arc 
Explanation: None