Eukaryotic pathogens include protozoa and fungi, unlike bacteria or viruses

Steps:

• Define eukaryotic pathogen as an organism with nucleus-containing cells, such as protozoa.
• Identify causative agents: Cholera by Vibrio cholerae (bacterium), HIV/AIDS by HIV virus, Malaria by Plasmodium parasite, Tuberculosis by Mycobacterium tuberculosis (bacterium).
• Classify agents: Bacteria and viruses are non-eukaryotic; Plasmodium is a eukaryotic protozoan.
• Select disease with eukaryotic agent.

Why C is correct:

• Malaria is caused by Plasmodium, a eukaryotic protozoan parasite, fitting the definition of a nucleus-containing eukaryotic organism.

Why the others are wrong:

• A: Cholera is caused by Vibrio cholerae, a prokaryotic bacterium lacking a nucleus.
• B: HIV/AIDS is caused by HIV, a virus that is acellular and not eukaryotic.
• D: Tuberculosis is caused by Mycobacterium tuberculosis, a prokaryotic bacterium.

Final answer: C