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: Biochemistry
Nucleic acid absorbs light at wavelength of 260 mm due to 
Select and explain. 
A. Proteins, B. Ribose, C. Purines & Pyrimidines, D. Deoxyribose
C: Purines & Pyrimidines
Answer: C: Purines & Pyrimidines 
Explanation: DNA bases (purines and pyrimidines) absorb UV light of 260 nm.