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 estimation can be done by \nSelect and explain. \nA. Spirometer, B. Spectrophotometer, C. pH meter, D. Sphygmomanometer', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. b. Spectrophotometer', 'role': 'assistant'}]