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
Trauma from occlusion does not effect 
Select and explain. 
A. Alveolar bone and enamel, B. Cementum and enamel, C. Epithelial attachment and gingiva, D. Periodontal ligament and Cementum
C: Epithelial attachment and gingiva
Answer: C: Epithelial attachment and gingiva 
Explanation: None