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: ENT
Changing in pitch of the sound is produced by which muscle - 
Select and explain. 
A. Posterior cricoarytenoids, B. Lateral cricoarytenoids, C. Cricothyroid, D. Vocalis
C: Cricothyroid
Answer: C: Cricothyroid 
Explanation: None