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
Cavo surface angle for amalgam restoration is butt joint as: 
Select and explain. 
A. It increass compressive and tensile strengths, B. Decreased compressive, increased strength, C. Decreased compressive, decrease tensile strength, D. Increased compressive, increased tensile strength
A: It increass compressive and tensile strengths
Answer: A: It increass compressive and tensile strengths 
Explanation: None