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
[{'content': 'Which of the following is least affected in Vit -C\ndeficiency \nSelect and explain. \nA. Gingival Fibres, B. Periodontal ligament, C. Blood Vessels of the gingiva, D. Epithelial lining of the mucosa', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]