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
[{'content': 'Which of the following is considered a contraindication for functional appliance treatment? \nSelect and explain. \nA. Class II Div. 2 pattern, B. Mandibular retrognathism, C. Proclined Lower incisors, D. Deep bite', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]