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: Dental
[{'content': "Diffuse form of hyperpigmentation is seen in- \nSelect and explain. \nA. Vitamin B12, deficiency, B. Ectopic ACTH secretion, C. Whipple's disease, D. All of the above", 'role': 'user'}, {'content': 'Answer: D \nExplanation: All the given options can cause diffuse hyperpigmentation (for detail read the causes of hyperpigmentation from the text of this chaptor).', 'role': 'assistant'}]