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
Developing crossbites are treated by using: 
Select and explain. 
A. Z spring, B. Tongue blade, C. Crossbite elastics, D. Bite plane
B: Tongue blade
Answer: B: Tongue blade 
Explanation: Tongue Blade Therapy
Tongue blade therapy can be employed in developing crossbite, when the maxillary incisor is erupting into crossbite and there is adequate space for the tooth to be moved.