This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Larynx, Subject name: ENT
True statement about paralysis of recurrent laryngeal nerve is 
Select and explain. 
A. Common on left side, B. 50% idiopathic, C. Cord will lie laterally, D. Speech therapy given
A: Common on left side
Answer: A: Common on left side 
Explanation: Paralysis of recurrent laryngeal nerve common on the left side. The common causes are Bronchogenic cancer Accidental trauma Thyroid surgery Thyroid disease (benign or malignant Cervical lymphadenopathy Carcinoma cervical oesophagus Carcinoma thoracic oesophagus Aoic aneurysm Mediastinal lymphadenopathy Ref: PL Dhingra Textbook of Ear, Nose and Throat, Edition 6, page - 299