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
Overall optimum degree of taper of tooth preparation for maxillary anterior tooth is: 
Select and explain. 
A. 6 degrees, B. 10 degrees, C. 14 degrees, D. 19 degrees
B: 10 degrees
Answer: B: 10 degrees 
Explanation: For anterior preparations, 10 degree taper is recommended.
For cast preparations, 6 degree taper is optimum.

Ref: Stephen Rosenstiel, Martin Land, and Junhei Fujimoto, Contemporary Fixed Prosthodontics 5th Edition