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
True statement about the paralysis of the 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
Aortic aneurysm
Mediastinal lymphadenopathy