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
A patient is having carcinoma larynx. The most likely other area having a second primary (synchronous second primary) is: 
Select and explain. 
A. Cancer base of tongue, B. Cancer oesophagus, C. Carcinoma bronchus, D. Carcinoma nasopharynx
C: Carcinoma bronchus
Answer: C: Carcinoma bronchus 
Explanation: Cancer lung is commonly associated with laryngeal cancer. However, any other area of aerodigestive tract may show synchronous second primary.