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
Crown Height Space (CHS) for implant dentistry is measure from 
Select and explain. 
A. prosthetic platform, B. junctional epithelium, C. crest of the bone, D. gingival margin
C: crest of the bone
Answer: C: crest of the bone 
Explanation: None