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
Blocking out undercuts in cavity preparation for CAD/CAM inlay is carried out by: 
Select and explain. 
A. Dentist after final cavity preparation stage, B. Laboratory technician before wax pattern preparation, C. The system automatically during the optical impression, D. Dentist in the wax preparation
A: Dentist after final cavity preparation stage
Answer: A: Dentist after final cavity preparation stage 
Explanation: None