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
Brown pigmentation is seen in which disease 
Select and explain. 
A. Addison’s disease, B. HHyperthyroidism, C. Nephritis, D. All of the above
A: Addison’s disease
Answer: A: Addison’s disease 
Explanation: None