Which of the Following Is Not One of Koch's Postulates

Multiple Choice

Which of the following is not one of Koch's postulates for determining whether a particular microorganism causes a particular disease?

A) The microorganism is always found in the diseased individual.
B) The microorganism taken from the diseased host can be grown in pure culture.
C) A sample of the pure culture of the microorganism produces the disease when it is injected into an uninfected host.
D) A host infected by injection from the cultured microorganism yields a new culture of the microorganism identical to the original culture.
E) A host infected by the microorganism can infect another organism by transmission of the microorganism through an insect vector.