AIDS is caused by which type of agent?
Answer and explanation
Correct answer: A. A virus (HIV)
- Step 1: Acquired Immunodeficiency Syndrome (AIDS) is a progressive immune system failure caused by infection of CD4+ T helper lymphocytes.
- Step 2: The causative pathogen is Human Immunodeficiency Virus (HIV), an enveloped, single-stranded RNA retrovirus using reverse transcriptase.
Answer
A virus (HIV).
Why not the others: 'A bacterium' causes diseases like tuberculosis, cholera, and tetanus; 'A protozoan' causes malaria and amoebiasis; 'A fungus' causes opportunist mycoses like candidiasis and ringworm.
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