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
Most common nerve pressed by an enlarged left atrium is - 
Select and explain. 
A. Phrenic nerve, B. External laryngeal nerve, C. Recurrent laryngeal nerve, D. Sympathetic nerve
C: Recurrent laryngeal nerve
Answer: C: Recurrent laryngeal nerve 
Explanation: Enlarged left atrium causes left sided recurrent laryngeal nerve paralysis.