<prompt> Nanotechnology has found tremendous application in the diagnosis of cancers because of all of following advantages, exceptNanocrystals exibit bright, photostable fluorescenceNonocrystals have a narrow spectrum wavelengthPeak spectrum wavelength is tunableNanocrystals exhibit a narrow difference between their excitation and emission peak spectra  <response>: Ansd. Nanocrystals exhibit a narrow difference between their excitation and emission peak spectra 