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
[{'content': 'Changing in pitch of the sound is produced by which muscle - \nSelect and explain. \nA. Posterior cricoarytenoids, B. Lateral cricoarytenoids, C. Cricothyroid, D. Vocalis', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]