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
Chin cap is used in 
Select and explain. 
A. Class I, B. Class II, C. Skeletal class III, D. Dental class III
C: Skeletal class III
Answer: C: Skeletal class III 
Explanation: Chin cap was introduced by Oppenheim. It delivers a force of 800 - 1200 (400 - 600 gms/side). The patient is asked to wear the appliance for 12-14 hours/ day.