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
The following OPG best indicates 
Select and explain. 
A. Combination syndrome, B. Excessive maxillary ridge resorption, C. Christensen’s phenomenon, D. Anterior ridge preservation syndrome
A: Combination syndrome
Answer: A: Combination syndrome 
Explanation: OPG showing features of combination syndrome – overhanging maxillary tuberosity, extensive mandibular ridge resorption, extrusion of lower anterior teeth.