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
Which of the can following myofunctional appliance be used in uncooperative patients with class II malocclusions? 
Select and explain. 
A. Activator, B. Frankel II, C. Bionator, D. Herbst
D: Herbst
Answer: D: Herbst 
Explanation: Indications for Herbst appliance: 

Correction of class II due to retrognathic mandible.
As an anterior repositioning splint, in patients having TMJ disorders.
Can be used in mouth breathers.
It is fixed, so can be used in uncooperative patients.