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: Skin
Acanthosis nigrans is most common due to carcinoma of: 
Select and explain. 
A. Bronchus, B. Breast, C. Colon, D. Testis
A: Bronchus
Answer: A: Bronchus 
Explanation: Bronchus