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: Surgery
What erupts from unerupted tooth : 
Select and explain. 
A. Dental cyst, B. Dentigerous cyst, C. Both of the above, D. None of the above
B: Dentigerous cyst
Answer: B: Dentigerous cyst 
Explanation: Essentials for diagnosis of a Dentigerous cyst: Epithelial-lined, developmental, odontogenic cysts. Second most common type of jaw cyst associated with the crown of an impacted, unerupted, or developing tooth. Well-defined, radiolucent, sometimes expansile lesion. Usually slow growing and benign. Initially asymptomatic unless long-standing with significant enlargement or secondary infection. Usually discovered on routine dental X-rays. Requires histopathologic examination for diagnosis. Ref : Smith R.A. (2012). Chapter 25. Jaw Cysts. In A.K. Lalwani (Ed), CURRENT Diagnosis & Treatment in Otolaryngology--Head & Neck Surgery, 3e.