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
False regarding acanthosis nigricans is 
Select and explain. 
A. Prognostic indicator, B. Velvety plaques on diy hyperpigmentation, C. Confirmatory sign of malignancy, D. Gastric adenocarcinma is commonest malignant association
C: Confirmatory sign of malignancy
Answer: C: Confirmatory sign of malignancy 
Explanation: C. i.e. Confirmatory sign of malignancy