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
Which of the following is not a difference between Centric relation and Centric occlusion? 
Select and explain. 
A. Centric relation is a bone to bone relationship. Centric occlusion is the relationship of upper and lower teeth to each other., B. Centric relation is for denture occlusion, whereas centric occlusion is present in natural dentition., C. For denture patients CR=CO. For natural dentition CR≠CO., D. In natural dentition, the centric occlusion is usually posterior to centric relation
D: In natural dentition, the centric occlusion is usually posterior to centric relation
Answer: D: In natural dentition, the centric occlusion is usually posterior to centric relation 
Explanation: Centric relation is present behind centric occlusion in natural dentition.