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
Bilateral recurrent laryngeal nerve palsy is seen in - 
Select and explain. 
A. Thyroidectomy, B. Carcinoma thyroid, C. Cancer cervical oesophagus, D. All of the above
D: All of the above
Answer: D: All of the above 
Explanation: Causes of bilateral recurrent laryngeal nerve palsy are: 

Idiopathic
Post thyroid surgery
Thyroid malignancy
Carcinoma of cervical part of esophagus
Cervical Lymphadenopathy.

NOTE:
Peripheral neuritis causes high vagal palsy which leads to both superior as well as recurrent laryngeal nerve palsy i.e. bilateral complete palsy.