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
The key ridge useful in assessing malocclusion is present on: 
Select and explain. 
A. Maxilla, B. Zygomatic buttress, C. Sphenoid bone, D. Mandible
B: Zygomatic buttress
Answer: B: Zygomatic buttress 
Explanation: None