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: Radiology
The radiopacity that frequently obliterate the root apices of maxillary molars is 
Select and explain. 
A. Maxillary sinus, B. Palatine bone, C. Zygoma and Zygomatic process of Maxilla, D. Orbital process of Zygomatic bone
C: Zygoma and Zygomatic process of Maxilla
Answer: C: Zygoma and Zygomatic process of Maxilla 
Explanation: FigureA  shows  the  inferior  border  of  the  zygomatic  process  of  the  maxilla  over the  molars.  This  structure  lies  buccal  to  the  teeth  and  appears to  move  mesially  as  the  x-ray  beam  is  oriented  more  from the  distal.  Similarly,  as  the  angulation  of  the  beam  is  increased vertically,  the  zygomatic  process  is  projected  occlusally  over the  teeth.