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: Surgery
A 14 year old boy has delayed eruption of the
second molar. Radiography shows a dentigerous cyst surrounding the crown of the tooth. The treatment of choice is: 
Select and explain. 
A. Extraction of the molar, B. Aspiration of the cyst, C. Observe, D. Expose the crown and keep it exposed
D: Expose the crown and keep it exposed
Answer: D: Expose the crown and keep it exposed 
Explanation: None