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 treatment of unilateral buccal cross bite: 
Select and explain. 
A. Bilateral expansion of maxilla, B. Unilateral expansion of maxilla of the affected side, C. Unilateral expansion of maxilla of opposite side, D. Unilateral expansion of posterior teeth of involved side
A: Bilateral expansion of maxilla
Answer: A: Bilateral expansion of maxilla 
Explanation: None