This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Skin, Subject name: Medicine
[{'content': 'What is the most likely cause of these skin changes? \nSelect and explain. \nA. Asteatotic eczema, B. Chronic venous stasis, C. Necrobiosis lipoidica, D. Pretibial myxedema', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Answer B. Chronic venous stasisThe chronic changes of dependent edema with hyperkeratosis, papillomatous plaques, and loosely adherent crust and cobblestone-like nodules is most consistent with chronic venous stasis, and is known as elephantiasis nostras verrucosa.', 'role': 'assistant'}]