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
Tensors of vocal cord are 
Select and explain. 
A. Posterior cricothyroid, internal interarytenoid, B. Lateral cricothyroid, internal interarytenoid 1, C. Thyroarytenoid, internal interarytenoid, D. Cricothyroid and internal thyroarytenoid
D: Cricothyroid and internal thyroarytenoid
Answer: D: Cricothyroid and internal thyroarytenoid 
Explanation: Intrinsic muscles acting on vocal cords: Abductors: Posterior cricoarytenoid Adductors: Lateral cricoarytenoid, lnterarytenoid (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 laryingeal inlet: Interarytenoid (oblique pa), Aryepiglottic (posterior oblique pa of interarytenoids)