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
[{'content': '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 \nSelect and explain. \nA. acd, B. abd, C. abc, D. ab', 'role': 'user'}, {'content': "Answer: B \nExplanation: Causes of bilateral recurrent laryngeal nerve paralysis are thyroid surgery, thyroid carcinoma, cancer cervical\xa0esophagus, cervical lymphadenopathy.\n\nAbout option 'c'\n\nBilateral neuritis due influenza, EBV or EBV cause bilateral vagus nerve involvement which results in bilateral complete (RLN as well as SLN) paralysis.", 'role': 'assistant'}]