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: Dental
Maxillary sinus is described as a four sided pyramid containing base, apex, roof and floor. The apex of maxillary sinus extends 
Select and explain. 
A. Laterally into zygomatic process of maxilla, B. Medially into zygomatic process of maxilla, C. Laterally into lateral nasal wall, D. Superiorly into floor of orbit
A: Laterally into zygomatic process of maxilla
Answer: A: Laterally into zygomatic process of maxilla 
Explanation: None