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
Following are the possible positions of vertical dimension (or Vertical dimension can be classified as following); Except 
Select and explain. 
A. Vertical dimension at rest., B. Vertical dimension at occlusion or occlusal vertical dimension., C. Vertical dimension in other positions of mandible., D. None of the above
D: None of the above
Answer: D: None of the above 
Explanation: Classification:

Vertical dimension at rest.
Vertical dimension at occlusion or occlusal vertical dimension.
Vertical dimension in other positions of mandible.
Vertical dimension at rest and occlusion are the two measurable guides and need to be determined.