This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Neck Triangles and parotid gland, Subject name: Anatomy
Different nerves are marked in the given diagram. Which of the following nerve supplies posterior cricoarytenoid? 
Select and explain. 
A. A, B. B, C. C, D. D
C: C
Answer: C: C 
Explanation: CHOICE EXPLANATION & ELIMINATION REASON 1 A - Cervical sympathetic chain 2 B - Vagus nerve 3 C- Recurrent laryngeal nerve 4 D - Phrenic nerve Recurrent laryngeal nerve supplies posterior cricoarytenoid muscle - abductor of vocal cord Recurrent laryngeal nerve supplies all muscles of larynx except cricothyroid. It also gives sensory fibers to larynx below vocal cord. External branch of Superior laryngeal nerve supplies Cricothyroid