This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Oral cavity, Subject name: Surgery
[{'content': 'All of the following are true about dental abnormalities except: \nSelect and explain. \nA. Dental cyst develops at the apices of caries tooth with necrotic pulp, B. Dentigerous cyst contain unerupted teeth, C. Dentigerous cyst is most common in upper 3rd molars, D. Ameloblastoma is most common odontogenic tumour', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Dental Cyst Dentigerous Cyst Ameloblastoma Develops at the apices of cariestooth with necrotic pulp More common in upper Jaw X-rays shows: Circular radioluscent area in relation to root of normally erupted tooth Margins may be Sclerotic Arises from unerupted teeth MC in lower 3rd molars Cyst also contains uneruptd teeth X-rays shows: Unilocular cyst or soap bubble appearance Benign neoplasm arising from ameloblas (odontogenic epithellum) MC odontogenic tumor Most ameloblastoma occure in mandible near angle and ramus of mandible', 'role': 'assistant'}]