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: Radiology
Atomic number of Tungsten is 
Select and explain. 
A. 74, B. 53, C. 63, D. 64
A: 74
Answer: A: 74 
Explanation: Tungsten -74
Iodine - 53