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: ENT
Pneumatocele is seen in fracture of - 
Select and explain. 
A. Maxillary sinus, B. Frontal sinus, C. Ethmoid sinus, D. Sphenoid sinus
B: Frontal sinus
Answer: B: Frontal sinus 
Explanation: None