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
Scaling stroke? 
Select and explain. 
A. Shorty & powerful pull stroke, B. Moderate to light pull stroke, C. Moderate to light push stroke, D. A long pulling stroke
A: Shorty & powerful pull stroke
Answer: A: Shorty & powerful pull stroke 
Explanation: None