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
For strength and rigidity, the vertical height of a finished
lingual bar should be at least 
Select and explain. 
A. 6mm, B. 7mm, C. 4mm, D. 5mm
C: 4mm
Answer: C: 4mm 
Explanation: None