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 main objective of obturation is: 
Select and explain. 
A. Fill the canal and prevent apical percolation of fluids, B. Fill the canal and prevent discolouration of teeth, C. Fill the canal to give support to restoration, D. All of the above
A: Fill the canal and prevent apical percolation of fluids
Answer: A: Fill the canal and prevent apical percolation of fluids 
Explanation: None