Protozoa can be transmitted by vectors.

• A. Transmitted by vectors
• B. Fecal-oral
• C. Ingested
• D. Airborne

Answer: (A)

Protozoa can spread from one host to another through living organisms called vectors. In vector-borne transmission, an insect such as a mosquito or tsetse fly picks up the protozoan from an infected person or animal, supports part of its life cycle inside the vector, and then transmits infectious forms to a new host when it bites. This route is seen with diseases like malaria and sleeping sickness, where the parasite relies on the vector to reach new hosts.

This makes the statement true because it highlights a legitimate way protozoa can be spread, distinct from fecal-oral transmission (through contaminated food or water) or ingestion (eating contaminated material) or airborne spread (which is not typical for protozoa).