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
Posterior palatal seal is recorded when the head is bent at: 
Select and explain. 
A. 30°, B. 15°, C. 60°, D. 45°
A: 30°
Answer: A: 30° 
Explanation: None