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: Pathology
Each of the following cyst is associated with an impacted tooth except: 
Select and explain. 
A. Dentigerous cyst, B. Calcifying epithelial odontogenic cyst, C. Keratocyst, D. Primordial cyst
D: Primordial cyst
Answer: D: Primordial cyst 
Explanation: None