Concept:HIV attacks and destroys lymphocytes, which are a major type of white blood cell.
Explanation:A healthy person needs enough white blood cells, especially lymphocytes, to fight infections.
HIV infects helper T-cells (lymphocytes) and gradually destroys them.
This causes the total white blood cell count to fall below normal.
A person with a very low white blood cell count has a weak immune system.
Such a person becomes vulnerable to many opportunistic infections.
Therefore, the individual whose blood test shows the lowest white blood cell count is most likely to have HIV.
Answer:The individual with the lowest white blood cell count among I, II, III, and IV is the one likely to have HIV.
