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': 'Which of the following laryngeal muscles constitute tensors of vocal cord? \nSelect and explain. \nA. Posterior cricothyroid, internal interarytenoid, B. Lateral cricothyroid, internal interarytenoid, C. Thyroarytenoid, internal interarytenoid, D. Cricothyroid and internal thyroarytenoid', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Cricothyroid and internal pa of thyroarytenoid (vocalis) together constitute tensors of vocal cord. Intrinsic muscles acting on vocal cords: * Abductors: Posterior cricoarytenoid * Adductors: Lateral cricoarytenoid, Interarytenoid (transverse arytenoid), Thyroarytenoid (external pa) * Tensors: Cricothyroid, Vocalis (internal pa of thyroarytenoid) Intrinsic muscles acting on laryngeal inlet: * Openers of laryngeal inlet: Thyroepiglottic (pa of thyroarytenoid) * Closers of laryngeal inlet: Interarytenoid (oblique pa), Aryepiglottic (posterior oblique pa of interarytenoids)', 'role': 'assistant'}]