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: Pathology
[{'content': 'Disease presenting as soft, velvety, verrucous, hyperpigmentation of axillae in an adult with adenocarcinoma stomach is: \nSelect and explain. \nA. Pemphigus, B. Acanthosis, C. Pemphigoid, D. Contact dermatitis', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Acanthosis', 'role': 'assistant'}]