This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Larynx, Subject name: Anatomy
Vocal cords are supplied by? 
Select and explain. 
A. External laryngeal nerve, B. Internal laryngeal nerve, C. Recurrent laryngeal nerve, D. Vagus nerve
C: Recurrent laryngeal nerve
Answer: C: Recurrent laryngeal nerve 
Explanation: Ans. c (Recurrent laryngeal nerve). (Ref. BD Chaurasia, Anatomy, 3rd vol., 3rd ed., 61)# The internal laryngeal nerve supplies the mucous membrane of larynx above the level of vocal folds.# The recurrent laryngeal nerve supplies below the level of vocal cords.# When both recurrent laryngeal nerves are interrupted, vocal folds lie in cadaveric position and phonation is lost completely.# When only recurrent laryngeal is paralysed, opposite vocal cord compensates and phonation is possible.