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
The wood's lamp filter is made of - 
Select and explain. 
A. Tin and chromium oxied, B. Nickel oxide and silica, C. Copper oxide and Barium oxide, D. Zinc oxide
B: Nickel oxide and silica
Answer: B: Nickel oxide and silica 
Explanation: B i.e. Nickel oxide and silica