(B) The eye-spot (stigma) in $Euglena$ and various Crustaceans contains a specialized red-colored carotenoid pigment known as $Astaxanthin$.This pigme

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(B) The eye-spot (stigma) in $Euglena$ and various Crustaceans contains a specialized red-colored carotenoid pigment known as $Astaxanthin$.This pigment is responsible for the characteristic red appearance of the eye-spot,which functions as a photoreceptor to help the organism detect light intensity and direction.