This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Molecular Biology Techniques, Subject name: Biochemistry
Quantitative DNA analysis/estimation is done by: 
Select and explain. 
A. pH meter, B. Sphymometer, C. Spirometer, D. Spectrometer
D: Spectrometer
Answer: D: Spectrometer 
Explanation: Ans. D. SpectrometerAbsorbance of UV light at 260nm can be used to estimate DNACan be done using spectrophotometer or simply spectrometer.Other options are self explanatory.