There are six links to the chain of infection, however the reservoir is the correct link to select.
The reservoir includes all the places in the environment where the pathogen or infection lives (this includes people, animals and insects, medical equipment, and soil and water)
The reservoir link in the chain of infection would be broken if there isn't a place for an infectious agent to thrive and reproduce.
Infectious agents may be defined as those organisms that are competent in delivering infection or infectious disease. It includes bacteria, fungi, viruses, etc.
The reservoir link encloses all the places of the surroundings where any infectious agents are found and are able to cause infections or infectious diseases.
Therefore, it is well described above.
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