This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Skin lesions and disorders of pigmentation, Subject name: Dental
Acanthosis nigricans is seen in - 
Select and explain. 
A. Diabetes, B. GIT cancer, C. Hypothyroidism, D. All of the above
D: All of the above
Answer: D: All of the above 
Explanation: Acanthiosis nigraicans are of several types. Benign includes obesity related, hereditary, syndromic, acral, endocrine and drug induced. Malignant associated with gastric adenocarcinoma and genitourinary cancers. Iadvl textbook of dermatology page 1010