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
Labial bar is indicated when ? 
Select and explain. 
A. There is diastema, B. There is labial inclination of teeth, C. There is lingual inclination of teeth, D. There is periodontally weak teeth
C: There is lingual inclination of teeth
Answer: C: There is lingual inclination of teeth 
Explanation: Rest all are contraindications for labial bar.