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': "The wood's lamp filter is made of - \nSelect and explain. \nA. Tin and chromium oxied, B. Nickel oxide and silica, C. Copper oxide and Barium oxide, D. Zinc oxide", 'role': 'user'}, {'content': 'Answer: B \nExplanation: B i.e. Nickel oxide and silica', 'role': 'assistant'}]