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
Functional basis of ionising radiation depends on: 
Select and explain. 
A. Functional basis of ionising radiation depends on:, B. Removal of orbital electron, C. Linear energy transfer, D. Adding orbital electron
B: Removal of orbital electron
Answer: B: Removal of orbital electron 
Explanation: B i.e. Removing orbital electrons