This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Head and neck, Subject name: Surgery
[{'content': 'Dentigerous cyst arises from \nSelect and explain. \nA. The root of a caries tooth, B. The periosteum of the fractured mandible, C. An unerupted permanent tooth, D. The sequenstrum of osteomyelitis of mandible', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Dentigerous cyst is a unilocular cystic swelling arising in relation to the dental epithelium from an unerupted tooth SRB,5th edition,360.', 'role': 'assistant'}]