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$CO _{2}$ dissociates in alveoli from carbohaemoglobin when

• A
  $\rho O _{2}=\text { low, } \rho CO _{2}=\text { high }$
• B
  $\rho O_{2}= high, \rho C O_{2}= high$
• C
  $\rho O _{2}= low, \rho CO _{2}= low$
• ✓
  $\rho O _{2}=\text { high, } \rho CO _{2}=\text { low }$