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 following is considered a contraindication for functional appliance treatment? 
Select and explain. 
A. Class II Div. 2 pattern, B. Mandibular retrognathism, C. Proclined Lower incisors, D. Deep bite
C: Proclined Lower incisors
Answer: C: Proclined Lower incisors 
Explanation: None