This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Proteins and Amino Acids, Subject name: Biochemistry
Radiation affects: 
Select and explain. 
A. RNA, B. DNA, C. Mitochondria, D. Cytoskeleton protein
B: DNA
Answer: B: DNA 
Explanation: Ans. (b) DNARef: Harper's Biochemistry, 30lh ed. pg. 724* Radiation exposure leads to increased destruction of DNA.* Radiation causes pyrimidine dimerization- leading to DNA damage.