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In a vertebrate eye the chief function of rods and cones is that:

[A].	The rods are important for vision in bright light and cones for vision in dim light	[B].	The rods are important for vision in dim light and cones in bright light
[C].	Both rods and cones are important for vision in bright light	[D].	Both rods and cones are important for vision in dim light

Answer: Option B