A blue or greyish coloration of the skin caused be lack of oxygen in the blood is called?

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A blue or greyish coloration of the skin caused be lack of oxygen in the blood is called?
A . Suffocation
B . Cyanosis
C . Tinting
D . None of the above

Answer: B

Explanation:

Cyanosis occurs when the oxygen saturation of arterial blood falls below 85-90%. It is often presents in the lips and nail beds first.