Which of the following is a separate condition or illness present in the same patient at the same time as another unrelated condition or illness?

A) Complication
B) Co-morbidity
C) Major complication or co-morbidity
D) Infection

Co-morbidity refers to the presence of two or more unrelated conditions or illnesses in the same patient at the same time. A complication is a medical problem that arises as a result of another condition or medical treatment. A major complication or co-morbidity is a particularly severe or significant co-existing condition. Infection is not necessarily unrelated to the original condition or illness.