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
A patient gives history of recurrent episodes of pain and swelling in Mandibular posterior region.He is diagnosed to have pericoronitis.The partially erupted 3rd molar was vital.On radiographical examination a well defined radiolucency was found with distal aspect of the respected tooth. What could be the daignosis: 
Select and explain. 
A. Dentigerous cyst., B. Paradental cyst., C. Eruption cyst., D. Periapical cyst.
B: Paradental cyst.
Answer: B: Paradental cyst. 
Explanation: Paradental Cyst
Aka:

Baccal bifurcation Cyst
Craig’s cyst
Collateral cyst
Mandi 3rd molar – Association.

Associated with VITAL TOOTH and recurrent pericoronitis DISTAL Aspect of mandi 3rd molar