Which one of the following statements is not correct ?

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

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