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A colour blind person has difficulty in distinguishing which of the two colours ?

  • A.Green & red
  • B.White & red
  • C.Blue & red
  • D.Red & black

Answer: A

A colour-blind person has difficulty distinguishing green and red.

Red-green colour blindness comes from a defect in the cone pigments, and the genes lie on the X chromosome, so it is far commoner in men - about 8 per cent, against 0.5 per cent of women.

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