<prompt> Bilateral BI recurrent laryngeal nerve palsy is are caused by -a Thyroid surgeryb Thyroid malignancyc Aneurysm of arch of aortad Viral infectione Mitral valve surgeryacdabdabcab  <response>: Causes of bilateral recurrent laryngeal nerve paralysis are thyroid surgery, thyroid carcinoma, cancer cervical esophagus, cervical lymphadenopathy.About option cBilateral neuritis due influenza, EBV or EBV cause bilateral vagus nerve involvement which results in bilateral complete RLN as well as SLN paralysis. 