Which of the following causes kala-azar?

Correct option is A

The correct answer is (A) Protozoa.

Explanation:
Kala-azar, also known as visceral leishmaniasis, is caused by a protozoan parasite called Leishmania donovani. It is transmitted through the bite of an infected Phlebotomine sandfly.

Information Booster:

• Kala-azar affects the liver, spleen, and bone marrow, leading to severe complications if untreated.
• Symptoms include prolonged fever, weight loss, anemia, and swelling of the liver and spleen.
• Treatment involves drugs like amphotericin B and miltefosine.

Additional Information:

• Virus – Causes diseases like influenza, HIV, and dengue, not kala-azar.
• Bacteria – Responsible for illnesses like tuberculosis, cholera, and typhoid, not kala-azar.
• Fungi – Lead to conditions like athlete’s foot and ringworm, not kala-azar.