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
Catlan's appliance is given for a period NOT more than 6 weeks because it 
Select and explain. 
A. Causes attrition of upper anteriors, B. Causes periodontitis of anteriors, C. Causes gingival recession in lower anteriors, D. Causes over eruption of posterior teeth
D: Causes over eruption of posterior teeth
Answer: D: Causes over eruption of posterior teeth 
Explanation: None