AIDS affects which part of the body primarily?

AIDS, or Acquired Immunodeficiency Syndrome, primarily affects the immune system. This condition is caused by the human immunodeficiency virus (HIV), which attacks and weakens the body's immune system by targeting and destroying CD4+ T cells, a crucial component of the immune response. As the immune system becomes compromised, the body becomes increasingly vulnerable to infections and certain cancers that it would normally be able to fight off.

An understanding of HIV and AIDS emphasizes the importance of the immune system's role in protecting against diseases. Without a functioning immune system, the body cannot effectively respond to pathogens, making individuals more susceptible to opportunistic infections and other health issues. Hence, the correct answer highlights the primary impact of AIDS on the immune system, which is essential for maintaining overall health and defending against various diseases.