Q. Which of the following diseases are caused by protozoans?
  1. Malaria
  2. Dengue
  3. Kala Azar
  4. Chikungunya
Select the correct answer using the codes given below:

Answer: Only 1 & 3
Notes: Malaria is caused by the Plasmodium protozoan. Kala Azar (visceral leishmaniasis) is caused by Leishmania protozoan. Dengue is a viral disease caused by dengue virus, and Chikungunya is caused by the Chikungunya virus; both are not protozoan diseases.