A drop of each of the following, is placed separately on four slides. Which of them will not coagulate?

Blood plasma

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Blood serum

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Sample from the thoracic duct of lymphatic system

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Whole blood from pulmonary vein

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Solution

The correct option is B Blood serum
Coagulation is the process by which the blood changes from a liquid to a gel-like form. Blood plasma will coagulate, as, it has clotting factors in it and fibrinogen protein.
Serum will not coagulate, as, it do not have any clotting factors and fibrinogen.
Lymph is more like blood plasma, so, contains clotting factors and will coagulate.
Whole blood obviously coagulate for containing the same above factors.
Thus, the correct answer is option (B).

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