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
Which of the following muscle act as tensor of vocal cord? 
Select and explain. 
A. Vocalis, B. Cricothyroid, C. Cricoarytenoid, D. Thyroarytenoid
B: Cricothyroid
Answer: B: Cricothyroid 
Explanation: Cricothyroid Vocalis which is the internal pa of thyroarytenoid act as tensor of vocal cord. Muscles acting as abductors of vocal cords: posterior cricoarytenoid Adductors of vocal cords: lateral cricoarytenoid, interarytenoid and thyroarytenoid (external pa). Muscles which acts as openers of laryngeal inlet: Thyroepiglottic (pa of thyroarytenoid) Muscles which close laryngeal inlet: Interarytenoid (oblique pa), aryepiglottic (posterior oblique pa of interarytenoids).