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
The condition in which the occlusal plane of the teeth lies nearer the Frankfurt plane than it does in normal occlusion is called 
Select and explain. 
A. Abstraction, B. Contraction, C. Protraction, D. None of the above
D: None of the above
Answer: D: None of the above 
Explanation: None