Which statement correctly distinguishes central cyanosis from peripheral cyanosis in chest disease?

Which statement correctly distinguishes central cyanosis from peripheral cyanosis in chest disease?

• A. Peripheral cyanosis shows on lips and tongue.
• B. Cyanosis is not related to oxygen saturation.
• C. Central cyanosis reflects increased deoxyhemoglobin; lips and tongue, while peripheral cyanosis affects extremities.
• D. Central cyanosis is due to polycythemia.

Answer: (C)