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: Radiology
A radiolucency associated with completely formed unerupted tooth is due to: 
Select and explain. 
A. Impaction, B. Dentigerous cyst, C. Periodontal cyst, D. Odontogenic cyst
B: Dentigerous cyst
Answer: B: Dentigerous cyst 
Explanation: None