Which of the following is not a mechanical vector?

Which of the following is not a mechanical vector?
 
  A.
  Fomite
 
  B.
  Human
 
  C.
  Fly
 
  D.
  Flea
 
  E.
  Fomite AND human

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The amount of infecting agent received by susceptible individuals is called the infectious
 
  A. exposure.
  B. number.
  C. dose.
  D. level.

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The period of time between exposure to an agent and the onset of disease signs and symptoms is called the
 
  A. prodromal phase.
  B. decline phase.
  C. incubation period.
  D. lag phase.

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Droplet nuclei typically travel no farther from point of release than
 
  A. 3 meters.
  B. 5 meters.
  C. 1 meter.
  D. They are suspended indefinitely.

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Which of the following is not a vector?
 
  A.
  Fomite
 
  B.
  Human
 
  C.
  Fly
 
  D.
  Flea
 
  E.
  Fomite AND human