Correct option: (C)

Explanation:

Retinol is the chemical name of the vitamin A, which is mostly found in carrots, milk, cheese, fish etc. Retinol is well adapted for light absorption in animals where it is converted into the light-absorbing molecule called retinal. Deficiency of vitamin A mostly affects the rods containing retinal and leads to a disease called as night blindness or poor night vision. Tocopherol is the chemical name of vitamin E, found mostly in wheat germ oil, brown flour etc. Its deficiency causes sterility in rats. Vitamin C, also called as ascorbic acid, is found mostly in citrus fruits, potatoes, tomatoes etc. Its deficiency causes painful disease of the joints and gums called scurvy.