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
Material of choice for sealing fresh 2mm perforation is: 
Select and explain. 
A. MTA., B. Calcium hydroxide., C. Iodoform, D. ZOE.
A: MTA.
Answer: A: MTA. 
Explanation: None