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: Surgery
After thyroidectomy cadeveric position of vocal cords are due to: 
Select and explain. 
A. Unilateral recurrent laryngeal nerve paralysis., B. Bilateral recurrent laryngeal nerve paralysis., C. Unilateral external laryngeal nerve paralysis., D. Bilateral external laryngeal nerve paralysis.
B: Bilateral recurrent laryngeal nerve paralysis.
Answer: B: Bilateral recurrent laryngeal nerve paralysis. 
Explanation: In case of bilateral recurrent laryngeal nerve paralysis, the vocal cords will be motionless, lying in a 'cadaveric position'. Immediate tracheostomy is the life-saving measure.