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': 'Crown Height Space (CHS) for implant dentistry is measure from \nSelect and explain. \nA. prosthetic platform, B. junctional epithelium, C. crest of the bone, D. gingival margin', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]