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
Instructing the patient to say "ah" with short vigorous
bursts will help in visualizing 
Select and explain. 
A. Soft palate, B. Posterior vibrating line, C. Anterior vibrating line, D. Junction of hard and soft palate
C: Anterior vibrating line
Answer: C: Anterior vibrating line 
Explanation: None