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': 'Ichthyosis is caused by – \nSelect and explain. \nA. Hemosiderosis, B. Refsum disease, C. Niacin deficiency, D. Steven johnson syndrome', 'role': 'user'}, {'content': "Answer: B \nExplanation: Syndromal ichthyosis (ichthyosis with additional characteristics) is seen in carvaj al syndrome, CHILD syndrome, Daffier 's disease, Refsum disease, Rud syndrome, Netherton syndrome, Neutral lipid storage disease, Tey syndrome, Senter syndrome.", 'role': 'assistant'}]