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
Average bond strength in enamel adhesion: 
Select and explain. 
A. 5-10 MPa, B. 20-50 MPa, C. 50-70 MPa, D. 70-100 MPa
B: 20-50 MPa
Answer: B: 20-50 MPa 
Explanation: Bond strength of enamel is higher than bond strength to dentin.
Enamel is 20-50 MPa.
Dentin is 15-25 MPa depending on agent used. 
Reference-Sturdevant 6th ed  Pg: 116