Question

______ is the most widely-recognized secondary immunodeficiency.

hla

sids

scid

aids

ms

Explanation:

To solve this, we analyze each option:

• HLA (Human Leukocyte Antigen) is related to immune recognition but not an immunodeficiency.
• SIDS (Sudden Infant Death Syndrome) is not an immunodeficiency.
• SCID (Severe Combined Immunodeficiency) is a primary immunodeficiency (congenital).
• AIDS (Acquired Immunodeficiency Syndrome) is caused by HIV, making it a secondary (acquired) immunodeficiency and widely recognized.
• MS (Multiple Sclerosis) is an autoimmune disease, not an immunodeficiency.

Answer:

D. AIDS