Answer:
(A). Cyanosis.
Step-by-step explanation:
Cyanosis can be defined as a condition, in which skin and mucous membrane turns into blueish in color. This abnormal blueness of skin is caused by low level of oxygen in blood cells due to problems in lungs, heart, or airway.
Some other causes for cyanosis include low temperature, high altitude, and low blood pressure. Treatment for cyanosis involves various drugs and methods that restore the normal blood flow to the body parts affected.
Thus, the correct answer is option (A).