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
Lingual fixed appliance is used in 
Select and explain. 
A. Bilateral loss of 1st molars, B. Bilateral loss of canines, C. Bilateral loss of laterals, D. Unilateral loss of premolars
A: Bilateral loss of 1st molars
Answer: A: Bilateral loss of 1st molars 
Explanation: None