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: ENT
Following total thyrordectory the patient duclops respiratory stridor cause is 
Select and explain. 
A. B/L recurrent laryngeal nerve palsy, B. B/L complete palsy, C. U/L recurent laryngeal nerve palsy, D. U/L complete palsy
A: B/L recurrent laryngeal nerve palsy
Answer: A: B/L recurrent laryngeal nerve palsy 
Explanation: None