Q: What is the term used to describe the situation when the levels of white blood cells in the body are abnormally low?  

Answer: B

Leucopenia is a condition where there is a decrease in the number of white blood cells, which are an essential component of the immune system. When the white blood cell count falls below 5000/microliter, it is considered to be abnormally low. This can be caused by a variety of factors, including viral or bacterial infections, bone marrow disorders, certain medications, or autoimmune diseases. It can lead to an increased risk of infection and other health problems.

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