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
Irregular radiolucent area related to apex of a non-vital teeth could be: 
Select and explain. 
A. Chronic PA abscess, B. PA cyst, C. PA granuloma, D. Early osteomyelitis
A: Chronic PA abscess
Answer: A: Chronic PA abscess 
Explanation: None