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: Pathology
Which of the following is least affected in Vit -C
deficiency 
Select and explain. 
A. Gingival Fibres, B. Periodontal ligament, C. Blood Vessels of the gingiva, D. Epithelial lining of the mucosa
D: Epithelial lining of the mucosa
Answer: D: Epithelial lining of the mucosa 
Explanation: None