This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Anatomy of Larynx, Subject name: ENT
Which of the following statements is true regarding vocal cords? 
Select and explain. 
A. Two muscles adduct (close) the vocal cords, B. One muscle abducts (opens) the vocal cords, C. One muscle adjusts the length of the vocal cords, D. One muscle adjusts the tension of the vocal cords
B: One muscle abducts (opens) the vocal cords
Answer: B: One muscle abducts (opens) the vocal cords 
Explanation: (b) One muscle abducts (opens) the vocal cords(Ref. Scott Brown, 8th ed., Vol 3; 889)All muscles of VC are adductorsThe tensors alter the length, hence tension of vocal cords. There are two tensors of VC.