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: Dental
An 18-year-old-female patient with swelling and pain in the mandibular third molar area will most likely to have: 
Select and explain. 
A. juvenile periodontitis, B. pericoronitis, C. pregnancy epulis, D. plasma cell gingivitis
B: pericoronitis
Answer: B: pericoronitis 
Explanation: None