Answer:
From what source do human beings contract rabies?
✔ From close contact with infected animal saliva.
Explanation:
People usually get rabies from the bite of a rabid animal. It is also possible, but rare, for people to get rabies from non-bite exposures, which can include scratches, abrasions, or open wounds that are exposed to saliva or other potentially infectious material from a rabid animal.
The correct interrogative pronoun is "Who" in "Who are you?" because "whom" is used as a relative pronoun and is used to denote a indirect object.