This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: X-RAYS, Subject name: Radiology
Rhenium is used in which pa of X ray Tube? 
Select and explain. 
A. Cathode, B. Anode, C. Focussing Cup, D. Filter
B: Anode
Answer: B: Anode 
Explanation: *Tungsten Rhenium Alloy is used as Anode in Modern X ray tube. *Nickel is used in Focussing Cup. *Aluminium is used in Filter.