In human eyes, colour perception is done by
a)	Rod cells only	b)	Cone cells only	c)	Both (a) and (b)	d)	Choroid layer cells

(b)

The neurosensory layer of eye is the layer on which image is formed, this consists of retina, which includes rods and cones in it. Rods are helpful for visualization in dim light and is responsible for black and white vision, while cone cells produce sharp, coloured image in bright light. So, cones are helpful in perception and differentiation of colours.