From the given assertion and reason, choose the correct option:
Assertion (A): AIDS-Acquired immunodeficiency syndrome produces a low count of defense cells.
Reason (R): Leukopenia is a condition in which leukocyte count is low.
A is true and R is true but is not a correct explanation to A.
Leukocytosis and leukopenia are clinical conditions in which a blood sample contains an abnormal count of leukocytes. When the leukocyte count in a blood sample is above the normal level for the individual, it is called leukocytosis. When the leukocyte count is lower than the expected normal level, it is called leukopenia. This condition occurs when some diseases, such as AIDS, attack these cells or when immunosuppressive drugs are used. Thus, AIDS results in the condition of leukopenia whereas leukopenia is not the direct reason for the low count of defense cells in case of AIDS.