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: Anatomy
[{'content': 'Muscles which open the glottis are: \nSelect and explain. \nA. Cricothyroid, B. Thyroarytenoid, C. Posterior cricoarytenoid, D. Lateral cricoarytenoid', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]