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
Radiation causes cell death by: 
Select and explain. 
A. Charring of nucleoproteins, B. Destroying their mitochondria, C. Ionization, D. Disruption of cytosol
C: Ionization
Answer: C: Ionization 
Explanation: None