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
Vocal cord palsy is not caused by: 
Select and explain. 
A. Vertebral secondaries, B. Left atrial enlargement, C. Bronchogenic carcinoma, D. Secondaries in mediastinum
A: Vertebral secondaries
Answer: A: Vertebral secondaries 
Explanation: (a) Vertebral secondaries(Ref. Scott Brown, 6th ed., 1/12/17)Superior and recurrent laryngeal nerves are not in close proximity to vertebrae.Rest of the given (mediastinal) conditions can cause left recurrent laryngeal nerve palsy.