Bilateral recurrent laryngeal nerve palsy is seen in -: (A) Thyroidectomy, (B) Carcinoma thyroid, (C) Cancer cervical oesophagus, (D) All of the above
Answer is D. 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.