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
Corononal 3rd root fracture occurs: 
Select and explain. 
A. Above bone crest., B. Below bone crest., C. Any of the above., D. None of the above.
A: Above bone crest.
Answer: A: Above bone crest. 
Explanation: Middle 3rd root fracture occurs below bone crest.