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
[{'content': 'Cell free zone \nSelect and explain. \nA. Also known as zone o HOHL, B. Contains abundant myelinated nerve fibers, C. Contains fibroblasts, D. Contains cytoplasmic process of fibroblast', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]