Question

which one of the following is an example of a causative agent?
○ bacteria
○ spores
○ parasites
○ all of the above

Explanation:

A causative agent is a factor that causes a disease or condition. Bacteria can cause infections (e.g., streptococcus causing strep throat). Spores (e.g., from some bacteria or fungi) can be causative as they can lead to diseases when they germinate and infect. Parasites (e.g., malaria - causing Plasmodium) also cause diseases. So all these are causative agents.

Answer:

D. All of the above (assuming the options are labeled A: Bacteria, B: Spores, C: Parasites, D: All of the above)