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
A permanent tooth with fracture involving apical one
third of root after treatment, would most likely: 
Select and explain. 
A. Exhibit internal root resorption, B. Remain vital and functional, C. Be ankylosed, D. Exhibit external root resorption and exfoliate
B: Remain vital and functional
Answer: B: Remain vital and functional 
Explanation: None