This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Head & Neck, Subject name: Pathology
[{'content': 'True about Dentigerous cyst: \nSelect and explain. \nA. Arises in relation to unerupted teeth, B. It most commonly encroaches maxillary antrum, C. Mandibular third molar is common site, D. Common in mandible', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. (a) Arises in relation to unerupted teeth, (c) Mandibular third molar is common site, (d) Common in mandible(Ref: Robbins 9th/734; Manipal Surgery 4th/292-93; Harsh mohan 7th/511-12)*Dentigerous cyst is defined as a cyst that originates around the crown of an unerupted tooth and is thought to be the result of fluid accumulation between the developing tooth and the dental follicle.*Radiographically, these are unilocular lesions most often associated with impacted third molar (wisdom) teeth. Histologically, they are lined by a thin layer of stratified squamous epithelium. Often, there is a dense chronic inflammatory cell infiltrate in the connective tissue stroma.*Complete removal of the lesion is curative.', 'role': 'assistant'}]