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: Unknown
Filament in X-ray made of: 
Select and explain. 
A. Tungsten filament, B. Chromium, C. Gallium, D. Selenium
A: Tungsten filament
Answer: A: Tungsten filament 
Explanation: Please remember: Target is not Tungsten inmammography, its made up off molybdenum.