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
Most recent form of MTA used as an intracanal irrigant? 
Select and explain. 
A. MTA-A, B. MTA-C, C. MTA-D, D. MTA-E
C: MTA-D
Answer: C: MTA-D 
Explanation: None