Question

Diseases carried from person to person through other hosts, such as animals or insects, are known as __________ diseases.

Answer 1

The right option is D. vector-borne

Diseases carried from person to person through other hosts, such as animals or insects, are known as vector- borne diseases.

Vector-borne diseases are infectious diseases transmitted between humans or from animals to humans through the bite of infected hosts such as animals or insects. Most of these hosts are arthropod vectors which are bloodsucking insects such as mosquitoes, ticks, triatomine bugs, sandflies, and blackflies. Examples of vector-borne diseases include West Nile fever which is transmitted through the bite of an infected Culex mosquito, Leishmaniasis which is transmitted through the bite of an infected female sandfly and Tick-borne encephalitis (TBE) which is transmitted by ticks.  

Answer 2

"Vector-borne disease"  is used to explain an illness caused by an infectious microbe that is transmitted to people by blood-sucking arthropods. 
So according to above explanation
D. vector-borne, is the correct answer.