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
Mushroom arch wire is used in 
Select and explain. 
A. Beggs appliance, B. Lingual appliance, C. Straight wire appliance, D. Edgewise appliance
B: Lingual appliance
Answer: B: Lingual appliance 
Explanation: Mushroom-shaped lingual arch forms
Natural variations in facial–lingual tooth dimensions are significant enough on the lingual  aspects to require routine first-order bends. Distal to the cuspids, mesial to the molars and  sometimes at the maxillary laterals.
Fujita introduced the concept of ‘mushroom-shaped  archwire’ in conjunction with the lingual appliance.