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 true about Catlan's appliance? 
Select and explain. 
A. It is used to treat cross-bite of maxillary posterior teeth, B. It is constructed on the lower anterior teeth with an inclined plane, C. If used for a long period it results in anterior deep bite, D. Of constructed on the upper anterior teeth it has a 45 degree angulation
B: It is constructed on the lower anterior teeth with an inclined plane
Answer: B: It is constructed on the lower anterior teeth with an inclined plane 
Explanation: None