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
Cephalometric analysis are used to evaluate growth changes by superimposing on: 
Select and explain. 
A. Sella - Nasion plane, B. Mandibular plane, C. FHP, D. Occlusal plane
A: Sella - Nasion plane
Answer: A: Sella - Nasion plane 
Explanation: None