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
pH of set MTA is: 
Select and explain. 
A. 7.2, B. 10.2, C. 11, D. 12
D: 12
Answer: D: 12 
Explanation: Mineral trioxide aggregate (MTA) is composed of tricalcium silicate, tricalcium aluminate, tricalcium oxide and silicate oxide.

Bismuth oxide is added to the mixture for radiopacity.
pH - 12.5 (when set).
Setting time is 2 hours 45 minutes.
Compressive strength—40 MPa (immediately after setting) which increases to 70 MPa after 21 days.