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
During extractions of maxillary second molar a 0.5mm perforation is created in maxillary sinus. The appropriate treatment would be to: 
Select and explain. 
A. Perform cald well-Luc procedure, B. Smoothen the bone and place suture across socket, C. Pack the opening with iodoform gauge and allow to heal by secondary intention, D. No treatment necessary
D: No treatment necessary
Answer: D: No treatment necessary 
Explanation: None