This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Endocrinology and breast, Subject name: Surgery
Vocal cord palsy in thyroid surgery is due to injury to 
Select and explain. 
A. Superficial laryngeal nerve, B. Recurrent laryngeal nerve, C. Ansa cervicalis, D. Vagus nerve
B: Recurrent laryngeal nerve
Answer: B: Recurrent laryngeal nerve 
Explanation: Reccurent laryngeal nerve injury is classically described as a paralyzed vocal cord with loss of movement from the midline (supplies all the intrinsic muscles of the larynx, except cricothyroid muscles). Injury to the external branch of the superior laryngeal nerve leads to loss of tension in the vocal cord (supplies cricothyroid) with diminished power and range in the voice Source : Bailey and Love 26th edition Pg: 762