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
[{'content': 'DNA denaturation is measured by absorbance at \nSelect and explain. \nA. 220nm, B. 230nm, C. 240 nm, D. 260nm', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Increase in the optical absorbance of UV light by Purine and Pyrimidine bases called hyperchromicity.( DNA bases absorbs UV light of 260nm).', 'role': 'assistant'}]