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
According to Miller's classification of increased tooth mobility, grade 3 would be 
Select and explain. 
A. 0.1 to 0.2 mm in horizontal direction, B. Upto 1mm in horizontal direction, C. > lmm in horizontal direction, D. Mobility in horizontal and vertical direction
D: Mobility in horizontal and vertical direction
Answer: D: Mobility in horizontal and vertical direction 
Explanation: None