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': 'The following muscle is an opener of the glottis - \nSelect and explain. \nA. Lateral cricoarytenoid, B. Posterior cricoarytenoid, C. Transverse arytenoid, D. Inter arytenoids', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Opener (abductor) of glottis is posterior cricoarytenoid.', 'role': 'assistant'}]