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: Skin
[{'content': 'Ichthysis is caused by: \nSelect and explain. \nA. Hemosiderosis, B. Refsum disease, C. Niacin deficiency, D. Steven johnson syndrome', 'role': 'user'}, {'content': 'Answer: B \nExplanation: B. i.e. Refsum\'s disease Icthyosis is seen in Hypothyroidism, AIDS, Refsum disease and LymphomaQ. (Mn-"HARLY i.e. name of motor cycle Harly Davidson).', 'role': 'assistant'}]