This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Kidney, Subject name: Medicine
These skin changes developed during treatment for end-stage renal failure. What is the diagnosis? 
Select and explain. 
A. Amyloidosis, B. Nephrogenic fibrosing dermopathy, C. Syphilis, D. Scleroderma
B: Nephrogenic fibrosing dermopathy
Answer: B: Nephrogenic fibrosing dermopathy 
Explanation: Answer B. Nephrogenic fibrosing dermopathyNephrogenic fibrosing dermopathy is characterized by diffuse, cutaneous, hyperpigmented, brawny induration, erythematous or skin-colored plaques with irregular borders. The cause of nephrogenic fibrosing dermopathy is unknown.