Which one of the following is the correct difference between rod cells and cone cells of our retina?
A. Rod cells - Vision in poor light; Cone cells - Colour vision and detailed vision in bright light
B. Rod cells - lodopsin; Cone cells - Rhodopsin
C. Rod cells - Low in number; Cone cells - High in number
D. Rod cells - More concentrated in centre of retina; Cone cells - Evenly distributed all over retina