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
A patient with a Pancoast tumor develops a loss of voice after radiation. It is due to - 
Select and explain. 
A. Vocal cord infiltration with secondaries, B. Involvement of recurrent laryngeal nerve, C. Irradiation to vocal cords, D. Radiation stenosis of larynx
B: Involvement of recurrent laryngeal nerve
Answer: B: Involvement of recurrent laryngeal nerve 
Explanation: None