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: Pathology
[{'content': 'Nanotechnology has found tremendous application in the diagnosis of cancers because of all of following advantages, except \nSelect and explain. \nA. Nanocrystals exibit bright, photostable fluorescence, B. Nonocrystals have a narrow spectrum wavelength, C. Peak spectrum wavelength is tunable, D. Nanocrystals exhibit a narrow difference between their excitation and emission peak spectra', 'role': 'user'}, {'content': "Answer: D \nExplanation: Ans'd. Nanocrystals exhibit a narrow difference between their excitation and emission peak spectra", 'role': 'assistant'}]