Which of the following causes relative polycythaemia?

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Relative polycythaemia is caused by a decrease in plasma volume (fluid deficit) which leads to an increase in the proportion of red blood cells in the blood. This can also be seen in conditions such as dehydration, burns, and certain medications. Increased RBC production (A) and elevated erythropoietin levels (B) are causes of absolute polycythaemia, while decreased RBC production (D) can lead to anemia.

Which of the Following Causes Relative Polycythaemia