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: Surgery
Secondaries in the neck with no obvious primary malignancy is most often due to: 
Select and explain. 
A. CA Stomach, B. CA Larynx, C. CA Nasopharynx, D. CA Thyroid
C: CA Nasopharynx
Answer: C: CA Nasopharynx 
Explanation: None