Q: What is serum in the context of blood?  

Answer: B

Serum is the liquid portion of the blood that remains after the blood has clotted and the clot has been removed. It is similar to plasma but without the clotting factors such as fibrinogen. This makes serum useful in many laboratory tests, as it provides a clear sample for analysis. On the other hand, plasma is the liquid part of blood that contains all the blood components, including red blood cells, white blood cells, platelets, and proteins such as albumin, globulin, and fibrinogen. Understanding the differences between serum and plasma is important in the diagnosis and treatment of various diseases and conditions.

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