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
The mean setting time of MTA is: 
Select and explain. 
A. 135 ± 5 min, B. 145 ± 5 min, C. 155 ± 5 min, D. 165 ± 5 min
D: 165 ± 5 min
Answer: D: 165 ± 5 min 
Explanation: The setting time for MTA is lengthy, about 165 minutes for the initial set and less than 6 hours for the final set, which is a major drawback of using this cement.
Phillip's science of dental material 12th edition page 332