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
Which of the following groups of fibres are not attached to alveolar bone? 
Select and explain. 
A. Transseptal, B. Horizontal, C. Oblique, D. Apical
A: Transseptal
Answer: A: Transseptal 
Explanation: None