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
[{'content': 'Each of the following cyst is associated with an impacted tooth except: \nSelect and explain. \nA. Dentigerous cyst, B. Calcifying epithelial odontogenic cyst, C. Keratocyst, D. Primordial cyst', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]