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 primary trauma from occlusion: 
Select and explain. 
A. The blood vessels present in periodontal ligament rupture and release contents in surrounding space, B. Adaptive capacity of tissues to withstand occlusal forces is impaired resulting in injury from normal occlusal forces, C. The alveolar bone is not damaged, D. Bifurcations and trifurcations are less susceptible to injury related to this condition
A: The blood vessels present in periodontal ligament rupture and release contents in surrounding space
Answer: A: The blood vessels present in periodontal ligament rupture and release contents in surrounding space 
Explanation: None