A

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Q. People who live at high altitudes have rosy cheeks because

  • (A) The rate of capillary circulation increases in the skin to make it look pinkish
  • (B) Red cell concentration is considerably above average in response to lowered oxygen pressure
  • (C) Haemoglobin has an increased binding affinity for oxygen and becomes deep red in colour
  • (D) All of these

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