<prompt> Cyanosis is not seen in-CHFCOPDCO poisoningHigh altitude  <response>: Ans. is c i.e., CO poisoing Hypoxic hypoxia hypoxemiaAnemic hypoxiaStagnant hypoxiaHistotoxic hypoxiao Cyanosis presentCauses : Hypoventilation as seen in interstitial lung disease COPD Cyanotic CHD Reduced diffusion capacity Right to left shunt, e.g. A V malformation VQ mismatch High altitudeo Cyanosis absent Causes : Anemia CO poisoningo Cyanosis presento Causes : CHF Shock Peripheral vasoconstrictiono Cyanosis absento Causes: Cyanide poisoning 