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 Nigricans in old patient usually indicate : 
Select and explain. 
A. Skin Disorder, B. Malignancy, C. Senile Brain, D. Usually found in negro
B: Malignancy
Answer: B: Malignancy 
Explanation: B. i.e. Malignancy