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 is indicative of: 
Select and explain. 
A. Internal malignancy, B. Endocrine disorder, C. Blooms syndrome, D. All
D: All
Answer: D: All 
Explanation: D i.e. All