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
A 40 year old male patient came for a routine dental checkup. Intra-oral examination reveals multiple teeth restored with silver amalgam restoration and glass ionomer base. The compressive strength of the base used in this patient is: 
Select and explain. 
A. 100 MPa, B. 77 MPa, C. 120 MPa, D. 90 MPa
C: 120 MPa
Answer: C: 120 MPa 
Explanation: None