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
[{'content': 'What erupts from unerupted tooth : \nSelect and explain. \nA. Dental cyst, B. Dentigerous cyst, C. Both of the above, D. None of the above', 'role': 'user'}, {'content': 'Answer: B \nExplanation: 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.', 'role': 'assistant'}]