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: Radiology
[{'content': 'Irregular radiolucent area related to apex of a non-vital teeth could be: \nSelect and explain. \nA. Chronic PA abscess, B. PA cyst, C. PA granuloma, D. Early osteomyelitis', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]