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Which one of the following is correct?

1. Serum = Blood - Fibrinogen
2. Lymph = Plasma + RBC + WBC
3. Blood = Plasma + RBC + WBC
4. Plasma = Blood - Lymphocytes

Correct answer: Serum = Blood - Fibrinogen

Solution

Serum is the liquid part left after blood has clotted, so it is essentially plasma without fibrinogen and other clotting factors. That makes option A correct.

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