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
Ichthysis is caused by: 
Select and explain. 
A. Hemosiderosis, B. Refsum disease, C. Niacin deficiency, D. Steven johnson syndrome
B: Refsum disease
Answer: B: Refsum disease 
Explanation: 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).