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
In root fracture of the apical one-thrid of permanent
anterior teeth, the teeth usually 
Select and explain. 
A. Discolor rapidly, B. Remain in function and are vital, C. Undergo papal necrosis and become ankylosed, D. Are indicated for extraction and prosthetic replacement
B: Remain in function and are vital
Answer: B: Remain in function and are vital 
Explanation: None