This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Nose and paranasal sinuses, Subject name: ENT
Pneumocephalus is seen in fracture of 
Select and explain. 
A. Maxillary sinus, B. Frontal sinus, C. Sphenoid sinus, D. Mastoid antrum
B: Frontal sinus
Answer: B: Frontal sinus 
Explanation: Pneumocephalus is the presence of air or gas within the cranial cavity.Pneumocephalus is seen in fracture of frontal sinus (Posterior table); may also be seen in ethmoid fracturesRef: Hazarika; 3rd ed; Pg 355