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 (B/I) recurrent laryngeal nerve palsy is/ are caused by -a) Thyroid surgeryb) Thyroid malignancyc) Aneurysm of arch of aortad) Viral infectione) Mitral valve surgery 
Select and explain. 
A. acd, B. abd, C. abc, D. ab
B: abd
Answer: B: abd 
Explanation: Causes of bilateral recurrent laryngeal nerve paralysis are thyroid surgery, thyroid carcinoma, cancer cervical esophagus, cervical lymphadenopathy.

About option 'c'

Bilateral neuritis due influenza, EBV or EBV cause bilateral vagus nerve involvement which results in bilateral complete (RLN as well as SLN) paralysis.