Which one of the following statements is not correct?

  • A
    Retinal is the light absorbing portion of visual photo pigments.
  • B
    In retina the rods have the photopigment rhodopsin while cones have three different photopigments.
  • C
    Retinal is a derivative of vitamin $C$.
  • D
    Rhodopsin is the purplish red protein present in rods only.

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