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: Pathology
Three stages in progression of acute odontogenic infection are 
Select and explain. 
A. Periapical osteitis, cellulitis, abscess, B. Abscess, cellulitis, periapical osteitis, C. Cellulitis, Abscess, periapical osteitis, D. Periapical osteitis, abscess, cellulitis
A: Periapical osteitis, cellulitis, abscess
Answer: A: Periapical osteitis, cellulitis, abscess 
Explanation: None