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AIDS (Acquired Immune Deficiency Syndrome) is caused by HIV retrovirus. The virus destroys the helper T lymphocytes thus reducing their numbers.

1. Common Cold, AIDS is a pair of viral diseases. Viruses are a very common type of infectious disease. Viruses are the smallest life-form existing, since they are not even a single cell. It is almost like they are not alive at all. They are small strands of DNA-like cell material. A virus consists mostly of RNA and cannot survive without host cells.
2. Malignant tumours may exhibit metastasis. Cancer (medical term: malignant neoplasm) is a class of diseases in which a group of cells display uncontrolled growth (division beyond the normal limits), invasion (intrusion on and destruction of adjacent tissues), and sometimes metastasis spread to other locations in the body via lymph or blood.
3. AIDS virus infects T lymphocytes (also called Helper cells). Cytotoxic T cells called T lymphocytes

Correct answer: AIDS virus infects T lymphocytes (also called Helper cells). Cytotoxic T cells called T lymphocytes

Solution

The AIDS virus specifically targets and infects helper T lymphocytes, leading to a weakened immune system.

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