Which component of a generic spectrophotometer isolates radiant energy of a specific wavelength (spectral isolation)and excludes that of other wavelengths?

Question

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A monochromator is a component of a spectrophotometer that isolates a specific wavelength of light by diffracting white light into its separate wavelengths and only allowing the desired wavelength to pass through to the sample. The entrance slit and cuvet are components that help to control the path of the light, but do not isolate specific wavelengths. The light source provides the initial white light, but does not isolate specific wavelengths.

Which Component of a Generic Spectrophotometer Isolates Radiant Energy of a Specific