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
Anterior maxillary occlusal projection shows all of the following except: 
Select and explain. 
A. Anterior maxilla, B. Teeth from 1st premolar to 1st premolar, C. Teeth from canine to canine, D. Anterior floor of the nasal fossa
B: Teeth from 1st premolar to 1st premolar
Answer: B: Teeth from 1st premolar to 1st premolar 
Explanation: In anterior maxillary occlusal projection, the central ray is oriented through the tip of nose toward the middle of film with approximately +45 degrees vertical angulation and 0 degrees horizontal angulation.
The primary field of this projection includes the anterior maxilla and its dentition, as well as the anterior floor of the nasal fossa and teeth from canine to canine.